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@dwaynejohnson11595 жыл бұрын
I've been reusing head bolts for 30 years and never had a failure. Thanks for sharing scientific proof though.
@jamesbond73804 жыл бұрын
Is this for reals?? I reuse them on heavy diesel and i did today on my first gas engine "LS"... the guy that gave me the job flipped out and got all mad that you never reuse torque to yield bolts i was bro its ok i do it kn heavy diesel and those heads hold and are way hi in compression...
@foxreviews22922 жыл бұрын
@@jamesbond7380 how do u know if they are still ok?
@TheDrivewayEngineer2 жыл бұрын
Because they're in a running engine
@foxreviews22922 жыл бұрын
@@TheDrivewayEngineer i mean when looking at them, is there a way to know
@TheDrivewayEngineer2 жыл бұрын
@@foxreviews2292 how do you know brand new ones are good by looking at them?
@seanmoore97134 жыл бұрын
Videos like this have given me the confidence to go out and give it a try for cheap instead of always thinking what if.
@savagenomore5 жыл бұрын
I asked an old engine builder once "when should I replace my head bolts" he said "when they break"...
@illduitmyself4 жыл бұрын
grampa never crammed 20lbs of boost into his small block...
@postmortemspasm4 жыл бұрын
@@illduitmyself doesnt change the answer
@peted52173 жыл бұрын
Grumpy Jenkins of SBC fame said OE SBC head bolts can be reused for ever [or til threads look sketchy]
@nsboost3 жыл бұрын
Grandpa never used TTY bolts either. Or made 1000hp. Lol You can use whatever you want. As long as your ok with saving the money knowing is could cost you time
@matthewstorm51882 жыл бұрын
The problem here is that, when they break, you often have a bigger problem than simply buying new bolts.
@DaDeCodeIsTruth5 жыл бұрын
Take it how y'all want to. But back when I replaced and relocated the sub frames in my 05 GTO I did extensive research on tty bolts. And after lots of reading and forum searching, the best I could get from a couple of claimed 'gm engineers' on the LS1 GTO forum; was tty is more about the factory torquing process than particulars to the bolt. And YES they can be reused. I ended up replacing mine with standard metric equivalency grade 8 bolts (accident necessitated subframe work) because the factory ones were stupidly priced.
@myoneblackfriend31514 жыл бұрын
I saw when Matt highlighted this test. Great work commenting on it, J.R.
@evopwrmods5 жыл бұрын
First off.......Thank YOU....I foudn your channel about a month ago and have been watching alot of your videos. Being a car guy that owned his own performance shop; I was the type to always get the best and run the best parts etc. But now that Im almost at retirement and have lived a few decades since having my own shop. I have become very frugal and now money to me is to tight-wadded and not spent on anything but necessities. I now Re-Use, Re-Cycle, and Re-Purpose everything that I come across. I am about to do an LS swap into an 4x4 OffRoad RV that I am designing and fabricating from the ground up. After finding your channel I am now in heaven with all the Great and Awesome Frugal information that you are laying on me. The LS series of engines is such an awesomely engineered mechanical device. Where old skool push-rof single cam; is better than new skool dual OHC setups. The simplicity is just insanely awesome. Such as with life also. we all could learn much from looking back to what the old timers ran in their hotrods and seeing if that might also work for us in today's hectic fast paced cruel world. Again Many THANKS for laying all this frugal-ness upon me. Not many channels go this route, you should do very well !!!!!!
@TheDrivewayEngineer5 жыл бұрын
Yeah, the old hot rodders would run a ball hone through an engine, maybe put rings on it and send it lol. Manufacturing processes have improved greatly, materials have improved greatly, and probably most importantly, any modern engine is fuel injected and overdriven. They idle down the highway at a perfect AFR for the most part, it's really not surprising they don't wear.
@deankay44344 жыл бұрын
Thank you for taking the time to film the work the other guy did. This is what ASTM would do to test or certify a product. Yes, the alloy in the bolt / stud means something to the end results, but the overall thinking of engineering is driven by marketing. No more grease zerks on factory suspension or steering components either. Look, aluminum expands and contracts in all directions 2:1. when bolted to iron or steel. So multilayer gaskets allow for some movement but imports have done this for decades. While at room temp, break 1 head bolt at a time, then re-torque it every 30k. LS exhaust bolts always break at the end so elongate the hole in the manifold / header, place a flat washer over it and it will never break again. It is not rocket science it is a bolt. Sure, grade 8 is stronger but things are not that complicated in basic engine fasteners. 35+ years an ASE Master Tech Retired Great job to everyone envolved!
@Johnny-jr2lq5 жыл бұрын
Thank you for putting honest information out there for guys who actually have fucking bills to pay and are just starting out everyone don’t have money to burn and throw away
@dustybeers5 жыл бұрын
True that x 10!
@OGbqze4 жыл бұрын
Fucking preach!!!!!!! I absolutely hate MFS who live with thier parents being handed 10k a month by daddy and make videos about how thier Lamborghini heads only have the top quality stuff and everything else is pointless.
@1Patient5 жыл бұрын
Ya, great info, good video. I like how you give your sources credit, and let the viewer decide. Take care bro.
@TheDrivewayEngineer5 жыл бұрын
Have to give credit where it's due, I'm just not that type of guy, thanks for watchiing!
@MadMaxGarage4 жыл бұрын
Aha, Matt from Sloppy always questions the status quo and wants proof..well there it is. Nice work. Now I have a crate load of of used bolts I’m going to sell😂
@stevenhzoll70575 жыл бұрын
Studs may allow the maximum thread engagement in the block,very important especially in aluminum.Bolts, if stretched may bottom before achieving the desired clamp load. One must be careful when pushing the limit. I guess it depends how far you want to go and what reliability you need. Thanks for the post.
@christophergaston56205 жыл бұрын
Steven H Zoll agreed. aluminum block is why I went studs, not for extreme strength 🤷🏻♂️
@firstplacelegendgamingmore98005 жыл бұрын
The stockers can be reused ,I wouldnt stretch them again with the tty process as the new bolts require. Just 65ft lbs of torque on a used tty bolt works great
@rickjeffjeff3 жыл бұрын
That's good advice.The test didn't tty then stretch,just stretch.I think it's understood that these bolts still seem very strong after removal.I think that's why people are tempted to reuse them.I have done your method and just ft.lbs. torqued and it works(BMW engine).On my buddies f150 Romeo engine;i put new head bolts,but,on the rods and mains,i used a punch and marked all the old locations.I put new bearings and tightened to the punch mark.Punch block,punch bolt,align punch marks.Just keep the same bolt in original location.He has around 60,000 miles on it right now.I'm sure i could have done the same on the head bolts or just torque to 75-85 ft.lbs..On the Romeo engine i read you can reuse the rod and main bolts but i wanted to be on the safe side.The head bolts i read that they should be replaced.I wish i would have attempted it with just the torque on the head bolts.
@sea_bass213 жыл бұрын
I'm building a 4.3 v6 and, considering the typhoons and syclones used that engine under boost, I feel a lot better about building a roughly 300hp naturally aspirated 4.3
@jasonnielsen21255 жыл бұрын
I have always reused the used head bolts and main bolts unless new ones are supplied or customer stipulates. I use them for my own engines as well as I’ve always suspected that the used bolts would harden up due to many heat cycles imposed on them through out an engines life. Thank you for this video and keep up the great work.
@jpskiskate20004 жыл бұрын
What about rod bolts? I'm contemplating on re-using mine
@rc38315 жыл бұрын
Thanks for pointing this test out that Sloppy Mechanics did so unless you going for the extreme boost it looks like it is best to save some cash and reuse stock head bolts. This is another reason that LS engines are the best bang for the buck.
@TheDrivewayEngineer5 жыл бұрын
Yeah, advanced manufacturing techniques and tighter tolerancing really make the difference on these.
@sterlingwitherspoon57095 жыл бұрын
Doug Mullen people will take you to court to prove that u can’t reuse those studs. Even if you have to remove new studs immediately people recommend not using them. I must say I’m still scared to find out. Lol.
@TheDrivewayEngineer5 жыл бұрын
😂😂😂😂 pretty much
@KillSwitchNY5 жыл бұрын
This guy is a hero. I am so glad I kept my seasoned head bolts.
@LittleOldBoat3 жыл бұрын
I just Reused my torque to yield on my 2.3 L Ford Lima , I cleaned & bristle brush the Blind holes lub the bolt with high pressure chassis grease. Use the big Snap On breaker bar torque the shit out of them , reminded me of piano string's ! What a great engine, The original boost engine!
@Antonio-so1cv3 жыл бұрын
Only reason I see to use studs over bolts is if you’re frequently disassembling your engine. I’m talking about disassembling it every other week or more for maintenance since continuous threading and torquing may damage the threads of the mating part where studs stay on the block. And the degradation of the both since they not only experience tension force but also twisting where as the studs only experience tension force. Studs are just impractical for regular performance engines.
@mikef-gi2dg4 жыл бұрын
Now that's DYI information I can use! This TTY bolt stuff was a big mystery until now. I personally will splurge and go ARP head bolts and reuse them at least once if it comes to that. My 99 l31 2500 gvan 350 had one strange bolt problem. The light weight intake manifold bolts, and 5 of the 12 exhaust manifold bolts, heads just popped off, replaced with ARP intake bolts and old Grade 8 bolts, problem solved. This info lets me know where I am at with stock thru aftermarket, thanks.
@rockroll95135 жыл бұрын
I just compromised; I went with the ARP head bolts instead of the head studs. Saved some money and can re-use the bolts. Best of Both Worlds.
@TheDrivewayEngineer5 жыл бұрын
The best solution is to keep your money lol
@chickenfishhybrid444 жыл бұрын
I would like to know how the ARP bolts would test. If someone is guna buy something I think the ARP bolts are a good option. A shop in town uses then on like ever LS build they do under 1000ish. I've used them in the past but can't say that stock stuff wouldn't have also worked in those applications
@TheDrivewayEngineer4 жыл бұрын
They test better I'm sure, they have a much higher tensile strength and can provide much more clamping... Stock stuff isn't a failure point though, so beefing it up is money wasted.
@chickenfishhybrid444 жыл бұрын
@@TheDrivewayEngineer I would hope and assume they would test better.. just would be cool to know. Again, like I said if someome is going to buy something I think the ARP bolts are a good option.. some people are going to replace the bolts regardless, even with at least new stock ones. For most people's builds they definately don't need the studs so mine as well save the money and buy the bolts.
@Johnny-jr2lq5 жыл бұрын
Further more I love the guys that spend all that dam money on crap they don’t need and there hobby doesn’t get finished it’s just a motor sitting in the garage because they ran outta money for the rest of the build
@TheDrivewayEngineer5 жыл бұрын
See it all the time, then they're trying to sell it for 1/2 the cost lol.
@ericmartin34154 жыл бұрын
i love the guys that walmart their stuff together , and think they are ballers ...they dont win car shows , dont win races . but they got their money to buy their beer . you stay cool guys
@amindnew5275 жыл бұрын
Love all your gr8 CONTENT!! old skool wrenchers, even on New LS 4 EVER!!!
@keysautorepair60384 жыл бұрын
I knew something was going on I have always reused headbolts the one time I didn't the gaskets failed in 3 months 20 plus years turning wrenches.
@rickjeffjeff3 жыл бұрын
Sounds like a different problem.Cheap gaskets,threads pulled out of block,cracked heads.He didn't say new heads bolts weren't good.He said they would also get stronger after using one time.
@ryanjarrett59333 жыл бұрын
Keep up the good work bro, i was an engineer for Delphi for till 08 when they filed bankruptcy....i used to have little "WTF" discussions with the main choads bout shit like this on the reg! I love letting these little "secrets" out
@ryanaustin19705 жыл бұрын
Excellent video , I'm not surprised by the results, used bolts will always stretch less because obviously they've already been stretched some and opposite with new bolts. It isnt a real comparison with the studs versus bolts because of how and where loads are applied . It was cool too see the cheap studs against the go to arp studs . Again not surprised with the results there . Keep in mind studs are designed to be reused . I see the point of this video and your previous regardless as to how I feel about all the info . I will say thou yes arp is pricey but when you spend thousands on an engine I'd prefer to not have reused bolts and wonder..."shit I hope this bitch stays together "as I'm flogging it down the track or some high rev burnout . Cheers
@andrewmontgomery17633 жыл бұрын
But that's also the point with the LS engines in general, that you can buy a 4.8/5.3 for $400, so spending nearly that on a set of ARP head studs (when these engines can reliably hold 700 crank hp with used head bolts) seems silly, unless you're going for 1500 hp, which 99% of people are definitely not.
@uncagedperformance20965 жыл бұрын
I re-use headgaskets and head bolts lol. This is some great info, and proves that you dont need $300 head studs.
@TheDrivewayEngineer5 жыл бұрын
Too bad people don't listen lol.
@uncagedperformance20965 жыл бұрын
@@TheDrivewayEngineer and we junkyardist are the dumb ones lol. After being disappointed with a 8k race engine, i pledged to never go back to building a race engine never again. I will continue to use junkyard stuff and thumb my nose at the ones that thinks im crazy.
@TheDrivewayEngineer5 жыл бұрын
@@uncagedperformance2096 I've learned the hard way myself, 23k into a 2v 4.6.... got 6k when it was t boned. 4800 bill at the machinist for a 363 302 based short block... That's when I started spraying 250 shots on SBEs lol... I finally learned.
@EnduroTainment4 жыл бұрын
What I wonder is that if you're still angle torquing the used bolts with the initial 22ftlbs, you're still going to elongate/yield the stock bolts again and they will likely be fine a few times since they hold the same force while yielding for a little bit. But, I'm guessing after a couple uses it will run out of yield and get closer to potential failure. I am still curious as to why the max load on the used bolts are superior. Heat cycles after the stretching almost forges the new grain? Who knows.
@thegoat53345 жыл бұрын
Sounds good to me, I'll reuse mine... thank you
@jacobrecord825 жыл бұрын
You should do a video on torquing the head bolts. I was always confused with torque to yield bolts.
@deankay44344 жыл бұрын
@jacobrecord82 Depending on which part, year & engine, the specs due change. I will use the “KISS” explanation. Ding the torque specs for your job. Start in the middle as if to smash a pancake outward. But first pass is low, in the middle, rotate in a circle until all have first torque sequence. Required on most you have a second level of tightness. Adjust your torque wrench for second round. If like many newer LS engines, require only two times, place tape or spray a liquid little red paint or uses a drawing. Repeat starting at center, go in a circle pattern, stop. If the next part is “Angel” write it down. In or out of a vehicle, place the handle where you can get on pull. Remember, 1/2 of a circle is 180 degrees, so 1/2 of that is 90. No reason to buy an angle meter, just make a sober attempt to achieve a single 90 degree pull to final tightness. If only 70 degrees, then stop short. Remember, this is like pointing on a circle, just in pie cuts. It is not that hard. ASE Master Tech-Retired
@liveandletlive28943 жыл бұрын
@@deankay4434 anyway to simplify that?
@ImNotHereToArgueFacts10 ай бұрын
At lot of unknown factors reusing these TTY bolts. The tests referenced were probably not well documented as to the life cycle of the bolts used and the torque specs/methods used during each install. Was the block and head steel or aluminum? What was the max temp ever reached on the engine(s)? If it's a junkyarder in a weekend hoopty, it might be different than if it's your reliable work truck used for hauling. I wouldn't reuse them blindly.
@jasonscott67315 жыл бұрын
I am a tech with 27 years exp, we were always taught to only use torque to yield bolts once as the torque, due to the stretch, was less every time they were reused. In saying this I work at a dealership (16 years) , we average 6 engines a week and unless there is damage (threads , rust, stripped etc) we always reuse the head bolts(torque to yield) as this is the manufacturers recommendation and new bolts are not supplied. The only failure I have ever seen was due to improper torque sequence (dumb tech) not the fault of the bolt. Keep using them, unless you are continuously boosting over 20psi these bolts are not your weak link.
@TheDrivewayEngineer5 жыл бұрын
Yeah I see alot of people leave crap down in the holes and fail to get them actually tight as well.
@TheGuruStud5 жыл бұрын
Reusing is stupid. Head bolts stretch, then stretch even more with boost. Dealerships are cheapskate criminals. This test is flawed. It's a one time load test. Running an engine is a NONSTOP load. This why the bolts continue to stretch, then you get a HG leak. Sure, they'll be tighter right after you reinstall...until they continue to stretch, b/c you just retorqued em.
@arturozarate1752 Жыл бұрын
Thanks for bringing this information closer to the "wandering" public. Test results don't lie.
@SteveAddis6 ай бұрын
This is really interesting info. I noticed auto parts people do not try to sell the TTY bolts for bearing assemblies. Now I just found out that the late Chevy I have needs TTY and of course I would need a angle gauge just to install. Just crazy, yet I suppose it has its purpose (connecting dissimilar metals). Would TTY be an improvement over standard, who knows? Thanks for posting!
@kid.0llie4 жыл бұрын
Love vids like this, true knowledge not just BS!
@TheDrivewayEngineer4 жыл бұрын
I appreciate that!
@daviddenman74795 жыл бұрын
I’m still not looking at my cam bearings🤣
@foreverendeavors62105 жыл бұрын
I have seen them Flake and cause low oil pressure..
@michaelangelo80014 жыл бұрын
Very good. Be interesting to see tests of rod and main bolts also...
@dave0z962 жыл бұрын
I’ve reused torque to yield connecting rod bolts on a John Deere 6068 and it was fine . 12 thousand hours later .
@davenelson15715 жыл бұрын
I once saw a comparison of assembly lubes for head bolts & that effected the torque reading causing wrong numbers. Would you care to comment on the effect of lube in the bolt torquing process?
@TheDrivewayEngineer5 жыл бұрын
To put it simply, what you're trying to achieve when tightening a bolt, is a certain amount of stretch in the bolt. The bolt will try to shrink back down to it's original size, and that's what provides the clamping force, the head of the bolt and the nut trying to draw back together. When you torque something, there's tables that say, at this much torque, you get this much stretch, therefore this much clamping force. So that's how an engineer sets a torque spec, just column a, row 3 on a table equals x stretch. There are variables though, no lube, straight 30w oil, or like, moly lube all provide different amounts of friction. So then the torque table goes out the window, because with no lube, vs moly, the moly is going to give more stretch at the same torque because of less friction. ARP provides a ARP lube spec, or a 30w spec because of this. However, it's all really mental masturbation, none of us are Jack Roush, and to the guy in his driveway, regular oil and the recommended torque spec is perfectly fine.
@hal26555 жыл бұрын
@@TheDrivewayEngineer When you are torquing a head 'bolt', you are turning it at the same time you are increasing the load on it. You are twisting the entire length of the bolt. Lube reduces the force required to over come the friction of the thread on thread action and the area under the bolt head, and is important for reaching the clamp load an engineer specifies it for. Dry torque vs wet torque is not mental masturbation, hence the call out.
@TheDrivewayEngineer5 жыл бұрын
@@hal2655 So you've repeated the same thing I already said lol.... I didn't say dry torque vs any other spec is mental masturbation, I said use oil and follow the recomended spec. Not get off into ARP's super secret squirell lube and alternative spec nonsense.
@wreckerman46914 жыл бұрын
I always thought you could reuse the head bolts but everyone trying to make money of what you don't need i did not know that for sure thanks
@matthewstorm51882 жыл бұрын
I have no doubt that a reused bolt will have a higher clamping force. The first tightening work hardened the bolt, which increased the yield strength. Tightening the bolts to the same spec the second time will therefore result in an even GREATER clamping force. The problem here is that work hardening also increases brittleness. By reusing TTY bolts, you increase the risk that a bolt will snap during tightening, which will put you in a world of hurt. This is particularly true if you decide to reuse the same bolt multiple times. The risk of even ONE snapped bolt just isn’t worth the relatively small cost of a set of new bolts, both in terms of monetary cost and stress. At least for me.
@Brooklyn-bn5go5 жыл бұрын
I have a feeling that the twisting force has an effect on used bolts, also @bdd1469 makes a good point. I guess if you can get the heads bolted down with enough clamping pressure to seal them to the block, and have not broken any of them it's worth it.
@marcmo71385 жыл бұрын
I like the studs because I can torque them without getting out my torque angle gauge. I snapped a main bolt trying to get to 80 degrees.
@TheDrivewayEngineer5 жыл бұрын
The torque angle is 90 lol, I feel comfortable I can eyeball them lol
@marcmo71385 жыл бұрын
@@TheDrivewayEngineerNo its 80 degrees on my 5.3
@TheDrivewayEngineer5 жыл бұрын
80, 90, close enough :D :D
@marcmo71385 жыл бұрын
@@TheDrivewayEngineer 220 221 whatever it takes. That's from a movie.
@TheDrivewayEngineer5 жыл бұрын
@@marcmo7138 Mr Mom lol
@David-lr2vi4 жыл бұрын
I reckon they only came up with TTY to make bolts a consumable item. As long as you don’t over torque the bolts into the plastic zone they should be theoretically infinitely reusable (within reason of course) if they are torqued using a standard torque number. Making the bolts TTY means you can’t reuse the bolts and get the same clamping force using the same TTY tightening procedure (ie: tighten to 20nm then 40nm, turn 45 degrees, stamp your feet twice and look towards the full moon!) which it entirely their plan! By only providing a TTY system they try and force you to buy new bolts but applying some logic to the issue I would say that (me not being a mechanical engineer btw) I would use the torque wrench the work out what the old bolts are torqued down to before removing them and then tighten them back down to that torque setting on reassembly.
@privatedata6652 жыл бұрын
This ^
@ImNotHereToArgueFacts10 ай бұрын
Link no more workie. Was that tensile testing done on the threads? Where is the bolt yielding? If it works, it works until it doesn't. I'd suggest measuring the bolts. Cleaning the block holes very well (perhaps chasing) and using a torque wrench that will show torque after angle is achieved. Low torque at required angle is a good reason to reject a bolt. I found these numbers somewhere. I'll comment to this with info if I can relocate it.
@ImNotHereToArgueFacts10 ай бұрын
Couldn't find it again. I'll continue looking, but not confident.
@firemanifd5 жыл бұрын
Nice! This is a great money saver
@oktoberchest2 ай бұрын
Hey, I replaced headbolts and the manual says *torque to 75nm *loosed all bolts *torque to 20nm *90° *90° I only did step one, torque 75nm only found out later i had to do all steps. I now have driven 160 miles without problems. Should I complete the steps, loosen them and then 20nm and the steps, or just leave it?
@oktoberchest2 ай бұрын
I'm in a mental split here, sir
@oktoberchest2 ай бұрын
My old timer neighbour says he never did the steps, he says to just leave them. What do you say?
@TheDrivewayEngineer2 ай бұрын
If it ain't broke... I'd roll with it
@oktoberchest2 ай бұрын
I loosened them and retighten them one by one. But my torquewrench starts at 40nm. So I did 40nm and 2* 90° somewhat, maybe a little less. Maybe they are too tight now I don't know, I checked every bolt at 75nm and it clicked right away. I drove 85km You think it will explode and leak again? You have some faith? Its a little 1994 lancer 1.6 four banger
@garymaya1767 Жыл бұрын
I guess the only time I would not reuse the bolts is when you buy a used vehicle and rebuild. Cause there’s probably a chance this could be the 3rd time around.. maybe there is a test on the 3rd use?
@Mowtivated110 ай бұрын
Man i love your attitude
@Ninja-es3fi5 жыл бұрын
With constant heat soaking I'm not surprised if they didn't harden a bit
@lucysmith42424 жыл бұрын
I was waiting for someone to question why the old bolts held more force. Could be that the new tty bolts weren't from the same manufacturer or the same batch of bolts. Also could be that the used tty bolts experienced some strain hardening. We need materials engineers and metallurgist to take a look at these.
@poet999992 жыл бұрын
wouldn't the use bolts have less elongation because they are ALREADY elongated? or is that 5% measure against a NEW untouched bolt? or was it a combined 12% over a fresh bolt
@davenelson15715 жыл бұрын
I really enjoy your videos! Please keep making them!
@adrenalinejunkie1265 жыл бұрын
Thanks for all the foot work bro. Super informative. My 240,000 mile 5.3 has never been apart. I'll be reusing mine, and probably the rest of the bolts that I removed except for...those damn exhaust manifold bolts🤣🤣🤣 3 were broke off, like everyone else's 🤣🤣🤣
@TheDrivewayEngineer5 жыл бұрын
The Dorman bolts are like 13 bucks, mine have been holding a turbo up for 2 years now lol
@adrenalinejunkie1265 жыл бұрын
@@TheDrivewayEngineer well then....I should try those. I'm going turbo eventually. Gonna be thumbing through your vids for turbo install tips
@jsomething25 жыл бұрын
I went with Dorman stud kit meant for a Mustang, 10.8 and nice locking nut. gotta get 2 kits, but super cheap and always handy to have M8-1.25 stuff around.
@adrenalinejunkie1265 жыл бұрын
@@jsomething2 gonna look into that too. Thanks bro
@brianawd5 жыл бұрын
The off the shelf ARP 8740 are garbage. They have been for years. I have lifted a head running them in the past at 28lbs on a 4g63t. It was a known issue back in the day to just run a stock head bolt or Swapped to L19s and never had an issue after.
@TheDrivewayEngineer5 жыл бұрын
I forgot about that, I haven't seen a 4g63t in years lol.
@LSCHEVYRYDER2545 жыл бұрын
they say the proof is in the pudding this would be said pudding lol
@SupraBdub5 жыл бұрын
Nice, looking forward to sharing this with my ls buddy, thanks again!
@TheDrivewayEngineer5 жыл бұрын
Thanks for watching!
@brandonleon795 Жыл бұрын
Quick question .. I'm building a 5.3 and had my heads milled .030 do I need to get shorter pushrods?
@danielsullivan98655 жыл бұрын
Great info you need to rate those Chinese turbos that everybody says don't make any power
@TheDrivewayEngineer5 жыл бұрын
I'm working on getting some storage space and engine dyno time to test some of these things this summer. Need to get the ole budget up first.
@motherlovinsnuffstar5 жыл бұрын
@@TheDrivewayEngineer I'll be looking forward to that!!!
@james107395 жыл бұрын
Did you see that ls vs coyote and they blew the head off at like 1800 hp or something im pretty sure that was stock head bolts but i guess thats when you go to bigger head studs
@TheDrivewayEngineer5 жыл бұрын
Seems like a solid reason to spend the money lol
@adwagner15975 жыл бұрын
Awesomely informative thanks!!
@jonesy_grows5 жыл бұрын
Good info, appreciate you taking the time to bring this to your channel
@sxs4l2455 жыл бұрын
Also. Doesn't ARP pull the stretch out of the bolt/stud, heat treat and box them? That's what I'm to understand. But I'm no engineer either. Thanks again.
@TheDrivewayEngineer5 жыл бұрын
Not exactly. They heat treat the raw material, then do all their operations. Heat treat only goes so deep into the material, unless they specifically go through the center. They roll the threads, which is stronger because it smashed the material in instead of removing it like a cutting die would. Mostly the are stonger because the base material has a higher modulus of elasticity, which is the point where it will stretch and not return. The force required to do that directly correlates to clamping load. SO basically, since you can crank them down harder without them failing, they clamp tighter.
@sexyfacenation5 жыл бұрын
@@TheDrivewayEngineer just to add to that virtually all bolts and studs have rolled threads, that's not really a specific arp feature.
@sKid-ts7hr3 ай бұрын
I bought a set of tty felpro bolts for my 4.6 ford engine. But after this video im thinking of using the old ones but do i have to use same torquing and angle steps !!!
@TheDrivewayEngineer3 ай бұрын
Just torque them like normal, make sure the holes are clean
@bimmerfab5 жыл бұрын
Head bolts curing and getting stronger over time very interesting!
@TheDrivewayEngineer5 жыл бұрын
Like fine wine 😂
@johntaylor19473 жыл бұрын
Good to know ,I would bet GM and Ford ect. buy pretty good bolts as they don't want warranty returns. When buying new bolts who knows what Quality they are.
@MrBojangles9014 ай бұрын
I like it dude. Feels so dumb to throw away what seems like perfectly good bolts. Also, any experienced mechanic will berate you for it. But then again the same oldschool mechanic thinks torquing bolts with angles seems stupid and nonsensical so take from it what you will, haha. I felt so stupid spending more than 100 dollars on BMW crankshaft bolts from reassembling the timing chain multiple times. Throwing those big, heavy, barely used bolts in the garbage. Here's my personal rule. Reuse TTY bolts at least once is fine. When doing the angle part go a little easy on it. So if the spec says 180 degrees maybe do 150. Reason being exactly what this video showed which is that the reused bolt will overtorque with the same procedure so if you reduce the angle slightly you should be in the right spot.
@Rippee425 жыл бұрын
Can you make a video on drivelines? I have a 4l80e for my 62 Nova with a 65 Nova rear 8.2. Junk yard drive line? How to know what yolk and all that. Thank you for your consideration
@TheDrivewayEngineer5 жыл бұрын
That's a great idea!
@Poaf-17 ай бұрын
So what is it saying ? What are the best ones to use? The old tty bolts ?
@TheDrivewayEngineer7 ай бұрын
The ones you got for free with your engine
@MichaelWittner5 жыл бұрын
What if turbos are going to be used is this still ok to reuse the bolts
@TheDrivewayEngineer5 жыл бұрын
Absolutely, they'll still provide the force you need.
@iamgoat30353 жыл бұрын
what is recomended for manifold bolts taking into consideration i have a broken one on each manifold already? i managed to weld a nut to one with threads showing and it came out easily so now im looking for extractor set to remove other one. so i dont imagine i can buy a pair of replacement bolts so should i get stock replacement set or ARP set?
@TheDrivewayEngineer3 жыл бұрын
DOn't use an extractor, keep welding to get them out. Dorman makes LS manifold bolts for like 13 bucks a set.
@pedrocontrerasavendano85783 жыл бұрын
The Driveway Engineer, after reading all the comments i still haven't figured out one thing, when reusing the bolts, should i just torque them to oem spec without the degrees or torque them to oem spec with the degrees?
@TheDrivewayEngineer3 жыл бұрын
It doesn't matter
@sheldonvanek97915 жыл бұрын
Great Info. dude! keep up the great video's.
@mattgemfran5 жыл бұрын
When reusing bolts do you tighten to a total torque spec or Low torque spec and series of quarter turns. I rescued on a k series Honda and it just didn’t feel even and went more than quarter turns all round. It hasn’t failed yet
@TheDrivewayEngineer5 жыл бұрын
I go for a torque spec
@OneBoomBox4 жыл бұрын
I know I'm a year late on this but what would you torque a used head bolt to 5.3 vortec what I was able to find online was 22 ftlbs then 90 degrees then 70. Is it okay to follow same torque procedure with used head bolts
@TheDrivewayEngineer4 жыл бұрын
Yes, that's what I typically do
@whoguy42314 жыл бұрын
Thanks man.... BEST information out there and it makes sense!!!
@maxgermain4 жыл бұрын
If reusing the used bolts, should the tty be done or just torque to a certain number?
@TheDrivewayEngineer4 жыл бұрын
I usually just follow the factory sequence
@ht00935 жыл бұрын
This only for head bolts? What about main cap and rod bolts?
@TheDrivewayEngineer5 жыл бұрын
I've been reusing those as well, however the test only covers the head bolts
@jeremydawkins83994 жыл бұрын
I bet it has to do with the heat cycles and relieving stresses built up in the metal from the manufacturing process. BMW using to only use 100K mile plus engine blocks they would buy back from customer cars to build their F1 Megatron engines. They said they were stronger because the metal fibers had naturally aligned through the thousands of heat cycles.
@Airman..3 жыл бұрын
Great information! How much torque do you shoot for on a used head Bolts?
@TheDrivewayEngineer3 жыл бұрын
75 ft/lbs, I don't always get there though. Sometimes I do another 90/90 degree too, depends on my mood that day lol.
@Airman..3 жыл бұрын
@@TheDrivewayEngineer i will start using this number, i followed gm specs precisely and ripped head bolt threads near the firewall on an AL 6.2 block, what a pain. Thank you
@TheDrivewayEngineer3 жыл бұрын
Yeah, you can feel when they're seem like they're not happy. I usually just leave them if they're close, or replace them if they're not
@tjt40363 жыл бұрын
Great info.
@kevinhumphrey9323 жыл бұрын
What do the subscriber's on this channel think about reusing the rod bolts what information I do find is kinda like the reusing the head bolts this is a 2010 5.3 engine I'm building with forced air I'm going to say it'll run around 9-13 lbs of boost nothing to crazy
@kevinhumphrey9323 жыл бұрын
It is the aluminum block with the DoD crap being disabled
@prancstaman5 жыл бұрын
Nice video. Ok, back in the day of school LeaRnIgs, loL, I was taught how to build aircraft piston driven and jet engines. Failure was not an option here. So, proper procedure, which you will find interesting, in replacing the important bolts. For example, jug bolts, main case half bolts, compressor section case bolts, and so on. To replace one of these bolts due to failure by to much stretch, or breakage. Yes, you measure the length of the bolt and given specs from the manufacture, anyways not the point. When prepping the new bolts, Yes, there is a prep procedure, you install the bolt and lube torque the bolt or dry torque the bolt, which depends on manufacture procedure and loosen the bolt, doing this 2 to 3 times before finally torqueing the bolt to specs for the install. Now compare this to what everybody is ranting about on those head bolts, Kinda funny, LOL. People at GM grabs a fresh new unused head bolt and torque them in the engine. Come on, that bolt has at least 3 or 4 more times of loosening and retorqueing left in it's life before it is even considered bad. Do a test of these bolts actually failing. Seeing how many times it take to torque and loosen the bolt for it to even be considered bad.
@TheDrivewayEngineer5 жыл бұрын
Part of the problem is people don't clean the holes out thoroughly. Combine that with the angle torque method GM recommends, and you get clueless people blindly reefing on bolts because the instructions said so, and you get both new and reused failures. Whenever someone posts a failure, and I can see the bolt up close, it winds up being an axial failure, from over torque, probably from dirty bolt holes
@MegamanEXEv24 жыл бұрын
I’m pretty new to LS stuff in the grand scheme of things, but when I was in Subaru land this was a constant back and forth too. Subaru says they are single use TTY head bolts, but basically every Subaru master tech reuses the ones they pull out.
@TheDrivewayEngineer4 жыл бұрын
I pretty much put people in two categories when it comes to this. People who have done it with no problems, and people who just read stuff on the internet 😂
@MegamanEXEv24 жыл бұрын
The Driveway Engineer a long time ago a buddy and I were flipping blown head gasket Subies on the side. The one part that always ate in to our profits the most were the new head bolts. We stopped bothering after we found out dealerships don’t bother either lol
@bdd14695 жыл бұрын
The reason the used bolts have higher numbers is because they have been stretched and NOT returned to their original length or elasticity. The reason a stud is preferred is they save the threads in the block from being destroyed from multiple torquings of headbolts on an engine that will be freshened up often. They also offer a more consistent clamping load across the head. The thing you havn't considered is how many times is that paper clip ( 200, 000 mile head bolt) going to bend (stretch), at every start up and flooging, before it decides it doesn't feel like working that day. $45 doesn't even cover a half hr of labor at my shop, I can't imagine risking the huge amount of time and parts involved over a failed bolt to save 1000th of a penny for every mile.......
@matthemberry5 жыл бұрын
Pretty cool you make $90 an hour. Some of us are poor. I couldn’t imagine spending money on something I already have. The fact is people have reused tty bolts with a very high success rate. I know I have and never had a failure. From Land Rover to Subaru, Chevrolet. That being said if I was charging for my work and running a shop I’d charge the customer an extra $45.
@bdd14695 жыл бұрын
@@matthemberry I wasn't saying I make $90 an hr....Any shop in my area charges $80-$125 an hr for labor depending on the size and if it is a dealer. I'm glad you've had good luck, I'm not one to risk my customers car or my time over $45. I don't have much money , but I do put arp studs and bolts in my motors to protect the parts that are actually expensive.
@TheDrivewayEngineer5 жыл бұрын
If a used bolt will fail without warning so would a new one, which is also used the instant you tighten it... So from the start your entire premise is invalid. I'm not advocating people do this to unsuspecting customers, and I'm not sure why so many of these discussions take that turn. I do not advocate being dishonest with other peoples property. I merely am presenting evidence for people to make informed decisions with their own property.
@TheDrivewayEngineer5 жыл бұрын
I think I'll reply anyway, nothing you said there adds up at all, but do tell us oh wise metallurgist wtf you're even going on about 😂
@CatlocosGarage5 жыл бұрын
Thanks for the info. Good job
@Sands10welding5 жыл бұрын
Awesome channel man! Im so happy i came accross this. Building my first turbo ls. Do you know anyone that has lifted the heads with boost on stock head bolts? If so do you know what psi they were at. Btw im shpoting for 600-650 for my build. Thanks for the great content, love the channel
@TheDrivewayEngineer5 жыл бұрын
Thanks for the compliments! There seem to be alot of factors at play, I ran 15-16 psi, made 640 HP, didn't have trouble. I've seen people hit them with 28-30, I've seen them fail at 10 lol. I think some people don't get the bolt holes blown out properly and that causes problems for them and confused the issue.
@davidcollins61643 жыл бұрын
what was the point of 'torque to yield' then?
@TheDrivewayEngineer3 жыл бұрын
To ensure extra force isn't put on the fastener.
@mtotheizatt5 жыл бұрын
Is this specifically for ls engines or all stock head bolts? I’m about to cheap out on allllll my engine builds
@mtotheizatt5 жыл бұрын
The Driveway Engineer thanks for the video. You make awesome content
@TheDrivewayEngineer5 жыл бұрын
Thank you!
@rongreen84853 жыл бұрын
I can't imagine a gas engine head bolt torqued beyond 120 ft. Lbs. Max. As long as it doesn't stretch you're good.
@dougharrison78444 жыл бұрын
If I was doing a budget LS rebuild use old bolts no problem, if I'm spendinig thousands on new rotating assembly for max reliabilaty at max performance a few hundred dollars on new bolts is a no brainer.
@MyLuckyStars843 жыл бұрын
when using the old head bolts, do I use factory torque setting or is there a recommended FT lb torque spec to use?
@TheDrivewayEngineer3 жыл бұрын
Use the factory spec again
@gearheadhuff78532 жыл бұрын
@@TheDrivewayEngineer so reuse the the tty process of decrees? Are ft/lbs
@CouchHam4 жыл бұрын
What about connecting rod bolts? Do you reuse them??
@TheDrivewayEngineer4 жыл бұрын
Yes
@Funtimes6705 жыл бұрын
What would be the torque amounts. I have seen 22 50 75-80. What do you do them to?
@TheDrivewayEngineer5 жыл бұрын
22 ft/lbs then 90 degrees
@Funtimes6705 жыл бұрын
The Driveway Engineer 90 degrees 1 time or 2? Do you do the shorter ones the same?
@Saddedude3 жыл бұрын
Curious how 1/2" arp studs woukd compare....
@TheDrivewayEngineer3 жыл бұрын
I'm not, since stock bolts have easily held 1500 tire and beyond.
@Johnny-jr2lq5 жыл бұрын
Warren Michigan checking in video # 8
@randywilliams43255 жыл бұрын
On the used head bolts - could the metallurgy be changed form heat cycling under a load ?
@TheDrivewayEngineer5 жыл бұрын
If we wanted to get real engineery, yes, Thermal expansion of the bolt length is: eb = αbΔTbLb. Thermal growth in the clamped members is: ec = αcΔTcLc. Next, length changes due to preloading at elevated temperatures are: δb = (Δb + δ) - eb, -δc = (-Δc + δ) - ec. Initial preload at room temperature is: Fi = kbΔb = -kcΔc. The bolt force at elevated temperature is: Fb = kbδb = kb(Δb + δ) - kbαbΔTbLb and clamped-member force at temperature is: -Fc = kcδc = kc(Δc - δ) + kcαcΔTcLc. Because no external force is applied to the joint, forces in the bolt and members must be in equilibrium - that is, Fb + Fc = 0. Therefore, (kb + kc)δ = kbαbΔTbLb + kcαcΔTcLc, or δ = (1/(kb + kc))(kbαbΔTbLb + kcαcΔTcLc). The new bolt force after the temperature change is: Fb = (kbΔb) + (kb/(kb + kc)) (kbαbΔTbLb + kcαcΔTcLc) - (kbαbΔTbLb) or Fb = Fi + (αcΔTcLc - αbΔTbLb)(kbkc/(kb + kc)). The stiffness factor at the far right is the combined internal stiffness ki defined as: kbkc/(kb + kc) = 1/((1/kb) + (1/kc)) == ki and 1/ki = 1/kb + 1/kc. The expression 1/ki is the compliance of the preloading loop. Therefore, the combined internal compliance of a preloaded bolted joint is the sum of the compliances of the bolt and clamped members. This lets us write the bolt-force equation in a more-compact form: Fb = Fi + (ec - eb)ki. Bolt load after a temperature change is the preload at room temperature and the product of the net thermal expansions and combined internal stiffness. This is similar to the expansion force of a bar blocked from both ends: ΔF = ke = kα(ΔT)L. Thermal effects may increase or decrease bolt load and clamping capability. Use this equation to weigh design options: either reducing the differential thermal expansion, giving the joint more compliance, or otherwise assessing the bolt stress at different temperatures. For example, the condition for invariant bolt load due to temperature is: αbΔTbLb = αcΔTcLc.
@randywilliams43255 жыл бұрын
The Driveway Engineer Much more of an answer than I bargained for . I feel like I owe you a beer . Thanks for your time .
@TheDrivewayEngineer5 жыл бұрын
Randy Williams just beat in mind, in the real world, none of this matters, the math has already been done, no need to over think it.
@yolofullsend5 жыл бұрын
I think that reusing the head bolts is scary because they're aged, might have microfractures or be weakened in such a way that you can't visibly see.. I'm sure 99.99% of the time you would be fine.. but that 1 time you snap off a bolt in the head... was it worth trying to save a few $$ then?
@TheDrivewayEngineer5 жыл бұрын
Yes.
@BADAZZ93STANG5 жыл бұрын
Dammit brotha. ..you should have went live...But awesome video!
@TheDrivewayEngineer5 жыл бұрын
No one wants to watch me do math for 10 minutes lol, that's why I cut it out
@BADAZZ93STANG5 жыл бұрын
Dude!!!! Give yourself more credit. Knowledge is power! !!!
@TheDrivewayEngineer5 жыл бұрын
WEll I cut it out because 6 or 7 minutes in my wife found a calculator that does it for you :D :D
@JayDee-bz2ge4 ай бұрын
missing a big difference in a stud vs bolt. this test didnt show at what TQ on the wrench = what result at the fastener , how consistent , etc... i prefer studs for the constancy and it's how it should be done if OEM wasn't cheap. and if anyone has an aluminum block.... i cant imagine not using studs.
@sheaadams865 жыл бұрын
what sealant do i put on my head bolts threads if i reuse them?
@TheDrivewayEngineer5 жыл бұрын
LS bolts don't go into water like Gen 1 bolts do, no sealant neeeed
@sheaadams865 жыл бұрын
@@TheDrivewayEngineer whats your opinion on reusing MLS gaskets?
@TheDrivewayEngineer5 жыл бұрын
I reuse them with some copper spray
@sheaadams865 жыл бұрын
@@TheDrivewayEngineer i thought about doing that but theres debris(hard oil deposits?) in between the layers im worried about causing a bad seal, how are you cleaning/prepping the old gaskets? maybe do a video on reusing MLS gaskets? 😉
@TheDrivewayEngineer5 жыл бұрын
Spray them, install them, don't think about it, live your best life :D kzbin.info/www/bejne/nHqUm3Vvrqd6asU
@donnie15815 жыл бұрын
Damn there are some salty people in here! I for one will be reusing my bolts. Thanks for the video!
@jonny5ive1674 жыл бұрын
so does this mean studs aren't all they have been cracked up to be?
@TheDrivewayEngineer4 жыл бұрын
That's been the general consensus below 4 digit power