If you buy a C6 Corvette Z06... Your LS7 Engine Could EXPLODE

[@natez0690]

FYI, the GM service manual says to replace the seals on the oil lines every time they are disconnected. Also, you have to be VERY careful to avoid putting a kink in the oil lines. They are poly and will be ruined if you bend them too much. I personally don’t put enough miles on my oil to worry about getting the last drop out of the lines. Also, my LS7 heads had 16,200miles on them and according to Lingenfelter, all of my exhaust valve guides were worn beyond the factory service limit! Just take your heads to a HIGHLY reputable machine shop that ROUTINELY does LS7 valve jobs and you’ll be good! In the DFW area, I’d personally recommend HPR in McKinney, TX.

[@jamesw.6931]

I want as much of the oil out as possible; how it's accomplished without removing the lines. 1. Drive onto the lift, raise and remove both drain plugs. 2. Turn off shop lights and close doors. 3. In the morning, lower the car and pour half a quart of oil into the dry sump tank, then wait until the oil stops dripping. Install drain plugs, install pre-filled oil filter, then fill the Lingenfelter modified 11-quart dry sump tank.

[@craigthescott5074]

I recently bought a perfect C6 Z06 3LZ with 28K miles I was going to pay $3K to get valve problem fixed but instead I put $8K in the engine had it built all Texas speed parts and now it’s a 700HP monster.

[@itsreallyjakub]

My man 🙌

[@Bejtiapur]

That's what a real man do, don't fixed, just modify it. #beaman.

[@keithmccarty4338]

@@Bejtiapur LOL... This made me laugh

[@DJNoMask]

That’s a pretty great value

[@luvregs]

The oil change procedure per GM does not specify removing the two dry sump hoses. I have a 2012 Grand Sport with manual. Every time I remove BOTH drain plugs and refill with oil, the car's taken 10.5 quarts, so that seems to be right on the money. I use Mobil 1 5W-30 with the Mobil 1 oil filter; my car has 52K miles...

[@c6moneypit8]

Same here. Got a 2013 GS 6spd and every oil change I don’t bother to remove the lines and drain them and I always get the proper oil level with 10.5 quarts. Also, I have 2 aftermarket oil coolers in each fender well and I’m sure there’s a quart in there between the 2 that don’t drain out but I’ll just live with it 😂

[@ManuelFresh100]

This is the best looking generation Corvette imo. The current one looks like its out of a video game

[@itsreallyjakub]

I love the C5 too but yeah C6 is basically perfect

[@waynecribb4922]

It seems that you found an excellent shop to do your work. That's a blessing in itself .

[@itsreallyjakub]

Yeah they’re the best

[@Canadian_Bajan]

I'll be bringing my Corvette there from Montreal next year as soon as I buy one.

[@frankalbino9201]

I had a guy Macmulkin recommended that totally ruined my heads. Go somewhere good

[@joels6736]

I did the valve springs on my LS6 this year, heads on the car, in a drive way, with a $70 amazon tool. It's the exact same procedure for the LS7. The biggest PITA of the job was pulling out the steering rack to gain access to the crank pulley in order to turn the engine by hand to bring each cylinder to TDC. I went with a COMP higher lift spring kit with everything in the box for a complete over haul. Revs to redline smooth as silk now.

[@Darksyne]

The car sounds so sick! Just joined the Corvette world myself. It’s no Z06 but it was the cleanest C4 I could find and I can’t wait to get it out of winter storage!

[@itsreallyjakub]

C4’s are crazy good value right now

[@Darksyne]

@@itsreallyjakub I always had a soft spot for the C4’s and when I saw this clean 100% stock 87 with all the options I wanted for 13k, I couldn’t pass it up 😂

[@marcoscamacho8913]

@@itsreallyjakub the ground connected to the alternator bolt is ground on the chassis?

[@itsreallyjakub]

@@marcoscamacho8913 yes it’s own chassis ground

[@marcoscamacho8913]

@@itsreallyjakub thank you 😊 bud

[@joeriedel9568]

I had Katech (located in Michigan) do my valve work and I couldn’t be happier with the work they did.

[@itsreallyjakub]

Yeah those guys know what they’re doing that’s for sure. I tried to get them to do my heads after my first “incident” with that other company. But since I sent out my stock heads and the company wouldn’t ship me any stock heads back I was screwed since Katech doesn’t have any cast heads. So I went with one of the best cast, Dart

[@Feledwards]

@@joeriedel9568 wasn’t it Katech who engineered the original LS7 heads? I thought I read that somewhere.

[@jamesw.6931]

@@Feledwards Katech did research into the LS7 head issue titled; "A weighty decision." They offered rebuilt exchange heads or rebuild the stock heads. When I called Jason, they were booked up, so he recommended "West Coast Racing Heads" in CA; which was the shop that rebuilt mine...

[@Feledwards]

@@jamesw.6931 was it Katech who engineered the LS7 heads for GM? I thought I read that somewhere.

[@Fraser-369]

Most Z06s by now, unless they have ultra low miles, have had this issue fixed…but ask for proof before you buy

[@itsreallyjakub]

Absolutely

[@Carado5150]

The "fixed" heads usually don't address the real issue of valvetrain geometry, they just try to prolong the time before failure.

[@Sandy-oy2lr]

10 1/2 years and nearly 125,000 miles. So far, the valves are holding out. Been on the track, too. Apparently, early in 2011, Linamar started doing 100% inspection of guide dimensions. So far, no engine related issues at all. Negligible oil usage between 8500-10K changes. Been using Amsoil since 1,000 miles.

[@Sandy-oy2lr]

@@jamesw.6931 Some interesting information. This is from the Ruthless Pursuit of Power on the situation; "GM Recognizes the Problem In mid-2012, official GM, finally, acknowledged the LS7 valve guide wear controversy. According to public statements made by GM engineers at the "Corvettes at Carlisle" event that summer and content posted on forum sites by Chevrolet Customer Service on 11 October 2012, the condition affected engines in "...some 2008-2011 Z06es." and was discovered during an investigation into warranty claims involving cylinder heads. The volume of problems with heads spiked from "...practically zero to 6.5 problems per 1000 engines." Chevrolet Senior Customer Relationship Specialist, Evan Sawaya, said in web forum posts, "Through inspection of returned heads, it was determined that a machining error in the valve guide had occurred at our head supplier." According to Sawaya, the most common customer complaint with engines having heads with worn guides due to this "...machining error..." is excessive valve noise. GM stated that the problem was solved in February of 2011 and the solution verified with inspection of 100% of cylinder head production. In any warranty return head with badly worn guides, much less one on an engine which experienced catastrophic failure, evidence of improper valve guide machining might be hard to obtain. It would be difficult to quantify original guide diameter or the relationship of the www.corvetteactioncenter.com/specs/c6/corvette-ls7-engine/ls7-engine21.html Page 1 of 9 Ruthless Pursuit of Power: The Mystique of the C6 Corvette LS7 Engine -original centerline of a worn guide to the centerline of its valve seat, so-how did GM arrive at a "machining error" as the probable cause? We believe it possible that the suppler, Linamar Corporation, determined the cause though an internal investigation, then advised GM of its findings. It is, also, possible that GM could document the problem in warranty return heads which sustained modest rather than severe guide wear. It also could have documented the problem by inspecting replacement heads on the shelves at GM Parts warehouses." Mine is a 2013. So I'm hopeful my heads were made after Feb 2011.

[@CZ-kz7ug]

West Coast Cylinder Head. Or aftermarket heads for any c6 z06 or 5th gen camaro z28. Nobody should be guessing that anymore.

[@LMBC6Brian]

9:20 EMI is from copper plugs like the NGK tr6 that everyone uses once they go big power. If you switch back to the irridium plugs like in the ZR1, the service charging system errors go away. Saw this first hand with my blower C6 a long time ago. Pulled the TR6 plugs in favor of the stock ZR1 irridium plugs and no more errors. Nobody thinks of this, but it was so simple.

[@busaofscbusaofsc8633]

I have a 2006 z06 for 5 years now and I have always changed my oil. I’ve never removed the oil Lines. Remove both bolts and refill with 8 quarts. It’s always in the lever mark when checked. Never heard of removing the oil lines.

[@81MercTurbo]

TimBits, and Timmy's coffee are things I look forward to when I go to Buffalo, NY!

[@itsreallyjakub]

Hell yeah

[@ScaleCrawling]

This is my dream car. I sold my C5 recently. I'm hoping to get myself a C6 Z06 in a year or two. 💛

[@itsreallyjakub]

Do it!

[@anthonymattocks6253]

that cold start is epic..... plus I always have to turn off my car in the drive thru...

[@samsrvp]

Hi I brought my 6speed 01 Vette there dyno tune . Dave and Nigel are the best! And nice guys aswell they make it right.. If you have a LS these are your guys... 6 Stars!

[@itsreallyjakub]

They are the best dudes

[@pyric]

They increased the capacity of the dry sump system because early cars had problems with oil starvation with sustained high Gs.

[@retrogamerdave362]

I had a dry sump insert and oil pan baffle put in since those are other potential weak points.

[@Bradimus1]

Worth it. LS7 Glory!

[@itsreallyjakub]

Agreed

[@murfenator82]

This was informative, and your car is absolutely insane!

[@rogerbrandt6678]

That’s friggin INSANE 640 rwhp. Awesomeness, wish you were my neighbour.

[@itsreallyjakub]

🫡

[@rogerbrandt6678]

@@itsreallyjakub I’m serious, I love fast cars.

[@RAM_C5]

606rwhp out of my HCI C6Z I've owned for 10 years... never pulled the lines for an oil change, never had an issue with a stock alternator either. Did need a better starter because long tubes melted it.

[@itsreallyjakub]

Right on. I also have a high torque starter because hot starts were impossible

[@esad-ij5ie]

I have 06 c6z. I'm ~600 whp can I ask are you both running stock compression. I'm still at 11.5:1 because I can only get 91 octane.

[@terrywix6844]

Very interesting video. I sold my prestine black 2007 Z06 only 13,600 miles after 28 months of ownership before having to deal with this catastrophe financial head disaster. A local world certified mechanic and lead corvette mechanic told me the heads can still drop a valve after repair. I'm not going to take that financial chance. I'm out!!! CASH IS KING...

[@HoopDawg34]

Nigel and Dave are always a blast...can't wait to see him tomorrow! Was good seeing you at the strip in this thing last year Jacob!

[@itsreallyjakub]

Best dude’s!

[@PMPerformance]

This dry sump draining thing boggles my mind. I have never seen any documentation anywhere. (Including GM) talking about pulling the lines. It’s gravity fed, so the tank should drain down to the pan (hence why GM says to get the car to 175* oil temps then shut it off for 5 min to check the oil properly. If this is really a thing, this is a new theory to me for sure

[@davidlambert7428]

I agree, I never heard about this before. I have change the oil on a couple dry sump corvettes. Always warmed them up before I check the oil level and never had an issue with too much oil. Maybe its a thing with the earlier LS7 with the smaller oil tank?

[@PMPerformance]

@@davidlambert7428 maybe, I didn’t know there was a diff tank size in diff years.

[@backnu]

Internet lies. This is stuff for views. Disinformation for likes

[@bigdaddyweav71]

This guy seems to know what he's talking about, but this seems bogus to me. You can see by the orientation of the lines that the oil is going to drain to the pan. Has anyone ever "overfilled" their engine by not pulling the lines? '07 small tank here. 8 quarts drained, 8 quarts back in, back to full level. 🤨

[@PMPerformance]

@@bigdaddyweav71 agreed he sounds like he knows what he is talking about, but this particular issue seems to be a non issue. First I have heard of it atleast.

[@toniricono5785]

Just got my 05 c6 6 speed velocity yellow, low milage corvette, i saved for 4 years, and now at 22, it's mine.

[@itsreallyjakub]

Congrats

[@kevinW826]

I use to live in Ontario up until last year. lived in Milton, worked in Brampton. My previous boss purchased a used 2009 Z06 Corvette from a guy who was retired. It had the replacement engine because of the valves dropping. My old boss loved how loud it was but at the same time hated it when the butterfly valves were open as it made him deaf. It was his favourite car. Jakub, I have the same Nike Monarch shoes. And toasted coconut chocolate timbits for me.

[@itsreallyjakub]

That timbit choice is suspect

[@kevinW826]

@@itsreallyjakublol. I love them

[@itsreallyjakub]

I’ll allow it. Anything but old fashioned plain

[@fabianmendoza61]

I grew chest hair when the vette started choppin

[@jorgejefferson8251]

Yes we call them 'donut holes' because.....'Merica'

[@itsreallyjakub]

🫡

[@kenphilpot1903]

Munchkins

[@Gearbhall]

My Z06 did valve drop and break on supposedly previously fixed heads. If you cannot absorb the cost of replacing the engine, get a Grand Sport rather. Keep in mind LS7s are discontinued and dealerships that held on to service replacements are gouging prices pretty badly.

[@Gearbhall]

Now that I finished the video, you addressed the same thing I've seen. I think you either budget for fully aftermarket heads or just get a grand sport.

[@ms3ben]

Ugh that sucks!! How about maybe finding another used LS7 online or junk yard and fix the heads before swapping in? The Grans Sport is nice, but heavier and has an LS3, which isn't the same..

[@TML34]

What year for a Grand Sport? @Gearball

[@169abr]

@@TML34 basically any of the later ones, the main thing is getting the LS3.

[@itsreallyjakub]

Sorry to hear that! I guess they weren’t fixed correctly

[@spiyder]

2:02 tim hortons is in the north eastern part of the country, i have a couple by my house. if i go south then i cant find any

[@MG77740]

It impacted 10% and most everyone fixed the valve problem and added a cam while they were as it. I have a yellow one like this with straight pipes hand it has really nice idling character at the intersections, harmonically bouncing side to side. Yep, scares the heck out of my wife just accelerating to 50 mph on the on ramps, lol. Its like, honey, I'm not speeding. It just sounds like it.

[@itsreallyjakub]

It does have a nice idle.

[@ace673]

Shame on GM too NOT stand by their faulty product, really bad ! Strange that no one have sued them.

[@toddprater14]

They didn’t stand behind the northstar engine, the 8 speed transmission issues, 5he cracked dashes on 07-13 trucks and SUV’s..and I’m sure there’s more…every automaker does this …

[@SonnyPruitt-q1s]

​@@toddprater14They didnt stand behind my brake line that sprung a leak because they routed it up against the exhaust manifold.

[@dennisblock1388]

I hear there's a class action law suit against GM for the valve drop issue

[@mike_0213]

Damn bro!! That C6 sounds freaking great!!!!!!!!!

[@itsreallyjakub]

It’s an animal

[@americacanwin]

this guy knows his stuff

[@JoseRivera-mv8lt]

This videos makes me wanna work 100x harder to afford one

[@itsreallyjakub]

Highly recommend hard work to afford one

[@jamesj5469]

He is by far the coolest Canadian

[@itsreallyjakub]

Thanks!

[@edventures9884]

C6 was my first car and I daily drove it, perfect car for me at the time. I’m now wanting a C6 z06.. I seriously think C6 is one of the best corvette generations. I would love a c6 ZR1 but those are getting out of reach, and can’t go wrong with a 7.0 (: Love the color too!

[@itsreallyjakub]

Yup C6 Z06 are still cheap in comparison to ZR1

[@doughooks7411]

I have a 2013 Z06 with ~ 5200 miles that I am considering selling, as I just bought a C7ZR1. What are you looking for?

[@kyletice811]

Can add a ceramic coated tunnel plate for rigidity and heat prevention in the tunnel. Did it on my C5 made a difference with longtubes.

[@JB-ej8zy]

Its a shame that gm never recalled all zo6's and fixed the heads the way they shoulda. Ya it woulda cost a lot of money but the cars cost a lot of money it was a bad move on their part.

[@frank8040]

I think most know Tim Hortons as there used to be Tim Hortons in the selected areas of the US. They have actually been theoretically an American company at one time 30 years ago as Wendy’s owned them since 1995 and then sold it to Burger King about 10 years ago.

[@vettevisionary]

Getting RPM heads and cam package done in a couple months on my C6 Z06. Also getting a MSD intake manifold. Can't wait for that chop and 600whp all motor! I currently have 46,000 miles on mine and no issues besides replacing the starter and it says service traction system time to time.

[@itsreallyjakub]

Be careful with those heads is all I have to say

[@marklagasse2012]

On Dart web page theirs says cast with 285 ported also, maybe yours was just unlucky draw……… RPM seems to do very good and reliable work

[@itsreallyjakub]

@@marklagasse2012 that's exactly it, luck of the draw with porting 285. That's why I should have gone with cast from the beginning. I also picked up over 13 wheel torque with the Dart heads

[@marklagasse2012]

Post how rpm does for you

[@allansanders5840]

I own a 2007 ZO6 with corsa intake and corsa exhaust, from original owner Installed sometime before 37000 km when I bought it. It has 55000 km now and GM said my car was not effected by the valve guide issue. Pulled the heads off myself, and they are perfect, just like GM said they would be. It doesn't make sense that GM would say some are bad, and some aren't, if that wasn't the case. So, IMHO I think if GM says yours aren't effected then they aren't. If GM says they are bad then you better get that fixed. I have never tracked my car, but I do drive it hard. I mean red line all the time, almost every time I take it out, after the oil temp is up. I think giving it too much gas at low RPM is very hard on these engines. If I do ever track it I will definitely get the oil tank with the goiter attachment since mine came without. Super fun car!!! Highly recommend!

[@nealynolen]

@@allansanders5840 how do you check with GM

[@raymondtan425]

I have a supercharge (vortech) ‘13 grand sport with a dry sump. Changed my own oil for 4 years, not once did I have to disconnect the dry sump lines. First time hearing that. It drains and fills roughly the same amount.

[@NOne-yt1tj]

Coffee and Timbits for your techs. I used to do exactly the same whenever I was getting work done. Bring coffee and snacks for the crew

[@itsreallyjakub]

Right?

[@danlaur7973]

The LS7 head issue is well known, the "fix" is more of a mystery, everything from aftermarket heads to new valve guides, to new valves have been suggested over the years

[@bretbauer7582]

It's not really a mystery.... a 8mm valve stem with a 2.200" head takes some care to cut a valve job for that is concentric with the guide. GM used form tool cutters, and just slammed them in there. Doing a precise job and correctly fixes the problem every time.

[@spikespiegel2246]

The fix is buying an LS3 C6.

[@richardcerritelli9657]

My fix is keep it stock and you have no problems with it. And stop listening to bogus Corvette forums crying about the valves and head issues with their highly modified car.

[@craigthescott5074]

I have the valve guides, valves, springs and roller rockers done but my whole engine was built and makes 700 to 750 HP!! Stock is for fudds.

[@craigthescott5074]

@@spikespiegel2246Why would you get rid of a 427 in a Z06? You would definitely devaluate the car by doing that. And there’s no comparison between a C6 Z06 and a base C6 for performance.

[@srmurc6zo6]

Most talk about what they think is a valve issue but I suspect a bigger issue is that the coating wears between the titanium rods. Once worn, the rods rub together or against the crank putting debris into the oil which makes the bad things happen.

[@bdd1469]

This is ridiculous. The crank and rods are separated by an oil film, not a coating. If the coating did wear away and do any damage, it would be very obvious by looking at the bearings. But that's not where these engines fail. It is always the valves guides.

[@srmurc6zo6]

@@bdd1469 How many Ls7s have you built? I would guess none. You are helping to prove my point. Most people replace valve train parts and think that they're ok but the reality is much different. Educate yourself regarding the use of titanium parts inside engines.

[@ShawnGilbert1967]

I run an LS7 in my 67 Camaro with Brodix BR7 heads. Few questions? 1. What did it make to the wheels with the ported stock casting setup? 2. Have you had it on the Dyno with 1 7/8th headers? What did 2" pick up or does it simply require that? ( I'm currently on 1 7/8 feel like it's choking it some). 3. Is that MSD Atomic Mamo or otherwise ported ( I have a hi ram but thinking of going to one ). Thank you for the video and information...

[@itsreallyjakub]

That thing must be insane in a 67. 1. It made 627whp so I picked up around 10whp and 15-20wtq with the Dart heads 2. No always ran these headers 3. Yes it’s a ported Mamo

[@ShawnGilbert1967]

@itsreallyjakub Thank you yes it is, Holley digital dash, Holley Ecu and a 4l80e OD trans with billet triple disc lock up converter!! When I'm getting gas ( I have flex fuel setup) people ask me what's in it? I'll tell em 427....LS....lol...then I'm shifting about 7500 with the high ram and the BTR Stg 4 V2 cam heh with 3" Xpipe... I think I'm gonna get some 2" headers for it ( this was done during covid there was very little choice then )... Thank you for the info, I almost went with a Mamo intake ( he has done a few sets of heads for me, but I thought it's an old muscle car I don't need it to balanced in power hehe) Thanks good luck 👍

[@itsreallyjakub]

@@ShawnGilbert1967 right on. I have a Holley Digital Dash and Terminator-X ecu in my foxbody. Works great

[@TheBBodyBuilder]

Love the mods…just the right amount of chop. What’s with the Nikes…trying to loose your Corvette card? New balance are the official shoes of the Corvette owner.

[@itsreallyjakub]

The real secret of corvette ownership is that New Balance are for C5 and older owners. Air Monarch are the new king

[@travismccarthy5681]

Your z06 sounds amazing! That socket to get the pulley off is called a triple-square…keep up the videos!

[@itsreallyjakub]

Thanks!

[@Leo-nu1hb]

Frankly, it sounds like a piece of junk when idling.

[@RandyOrtonsfather]

I know in the eastern Midwest a lot of people grew up with Timmy Hortons.

[@angelo_giachetti]

I had the same DEI heat deflector and it did take longer to heat up your left leg but not much.

[@itsreallyjakub]

Left leg?? Are you in Britain

[@YeahItsYourBoyG]

Tim Horton's was always great before a morning flight lesson.. I'm looking at you Tim Horton's Edinboro.. I love you..

[@benholtvoigt8135]

chopitie chop chop. I did replaced my heads. Didn't upgrade anything but the rockers. Mostly stock except radio, Corsa Sport, and MGW shifter. I do kinda regret the shifter. Love my '06 C6 Z06! Awesome.

[@itsreallyjakub]

I thought about getting the shifter after everyone’s rave reviews. But then I used one. Seemed extremely stiff

[@tomieevukic7522]

What amazing sound and power 😎 must be intoxicating!

[@itsreallyjakub]

It is!

[@whatsupwithsteve]

I sucked a valve right at 50k miles and Chevy covered it...thank goodness. They must have detuned it because it didn't run nearly as well as before the valve so I went and had the top-end done with a nice cam (a clip on my channel), 385, tune etc. It was incredible but a pain in the ass dodging smog every 2 years and constant niggling problems so after 12 really fun years I sold her. I miss that car...:)

[@chaseshawn]

Aberfoyle timmies !!! Used to work Nextdoor lol . I love the sound and chop of this vette

[@carlosjackson3307]

In 2013 they said to use ss valves in your head job. My engine failed at 29k miles. My engine was destroyed and GM did nothing because it was out of warranty by years. Oil was chocolate milk and spark plug head melted in valve 1.

[@thatz06]

without a doubt bringing my c6 z06 to race ready garage when i pick it up for the heads to be done. nice video

[@itsreallyjakub]

Couldn’t recommend them enough

[@scudzuki]

When your LS7 heads are rebuilt, do not rebuild them with hollow stem ex valves. Period. The guide wear issue is not why they drop valves. People have reported dropping hollow stem ex valves even in rebuilt heads. Use the valves with the strongest stems. I've disassembled 2 sets of LS7 heads, one set with 15k miles and the other with 38k miles. The wear on the intake guides I measured (I'm a machinist) was far greater than the ex guide wear, and some intakes guides were very sloppy, even in the 15k mile heads. Later manufacture Ti intake valves have an extra micropolishing process run on the stems, as they believe that the rougher finish on earlier Ti valve stems was accelerating wear compared to the ex valve guide wear. Still, I've yet to see a report of a Ti intake valve failure even though their valve guides wear more. There were 2 manufacturing issues found in brand new heads back in the 20 teens as delivered by the contractor that supplied the assmblies to GM. One was eccentricity of the valve seats to the valve guide bores. This results in the valve flexing sideways every time it closes, and that in turn creates a side load on the stems which accelerates guide wear. Another issue found with the assemblies is the location of the rocker stand mount hole vaied by .050", exactly, some being one distance from the guide bore, and others being exactly .050" different. This would result in the variation in how the rocker tips sweep the stem tips (or lash caps) when the valve is in motion. If not optimized, at worst, there can be accelerated rocker tip and valve tip wear, at the least, there could be excessive side loading of the stem (and guide), again, accelerating wear and, once the guide bore ovals, increased bending of the valve when it closes as effectively there would be greated eccentricity between the stem and valve seat. Also the N/A vs FI argument re: cylinder wall thickness has one glaring flaw; an N/A engine with a crank output of X has roughly the same cylinder pressures as an FI engine making X. The means by which that cylinder pressure is achieved is different, but to achieve the same output, roughly the same amount of fuel is burnt, and to maintain stoichiometry, roughly the same cylinder pressures are required. The FI engines produce slightly more power before it is sacrificed to the device compressing the intake charge, but that's only a few percent of the crank output when we're comparing FI engines with the same output NA engines.

[@hangfire6368]

I bought a set of new LS7 heads about 5 years ago for a good price. I need to send them off. They will go on a Dart block into a 66 nova project. The car will look stock from the outside. It will be a Drag N Drive car. NA with a manual transmission.

[@itsreallyjakub]

Right on sounds fun

[@bobbysalinas4845]

I know exactly how you feel! I also enjoyed the video.

[@itsreallyjakub]

Awesome! Thank you!

[@theplayernkc]

I could see the wheel spin just watching the RPM during the dyno run.

[@itsreallyjakub]

I have new tires on for this season lol

[@robertmatas4192]

Your car sounds bananas!! 🔥

[@frankmirandosr875]

Great Video, I just bought a 06 Corvette Z06 with under 9k on the clock. It is totally Stock. Does anyone know what Shop On or Near Long Island that they can recommend To go to For This Head Issue ? Thanks.

[@craigthescott5074]

Oh thanks for not calling the Z06 a Zed O6. That bugs the F out of me and Canadians do it a lot.

[@KokomoMeineke]

one drain is for the pan the other is for the sump there is no need to drop the lines

[@louismazza9966]

It’s very simple, change the heads, no big deal fellas 🇺🇸🇺🇸🇺🇸🇺🇸

[@itsreallyjakub]

Exactly

[@mikebroom1866]

Sour cream. Always.

[@itsreallyjakub]

Now we can be best friends because I trust your opinion

[@PhilMeadJams]

Scream for the cream

[@y0ungtchalla420]

Ehhh per the manual the oil line part is not required when changing oil

[@SloJoeRacing]

I have only ever drained the two plugs and have some smoking at wide open throttle on track. Interested to see if the dry sump line removal improves it

[@itsreallyjakub]

Try it!

[@DrivenbyAlex]

joe , 2 plugs becuase 1 is for the dry sump, no need of disconnecting lines.

[@sbklvr]

Gotta take the ol' LS /vtec up there, lol. Sweet Vette Jacob. The Cobra is badass also.

[@itsreallyjakub]

Haha thanks

[@theeyks]

What camera are you using? Great channel.

[@waynecribb4922]

You should never "apologize " for the noise ! BTW it's not noise. IT'S MUSIC !!

[@jeffg4008]

I still miss mine. 42 thousand trouble free miles, with the exception of a weeping head gasket that was replaced under warranty. I never drained the dry sump lines and somehow never over filled it. I have never seen anyone drain those lines....interesting

[@TehZured]

I have a stock 2008 z06 with 69,000 miles and no problems too. My previous 2009 that I sold has 110k miles with stock motor and hasnt exploded either lol

[@jeffg4008]

Yep, mine was a 2008. I guess I possibly got lucky, but it was abused daily. Lots of dropped valves out there, so it's a real thing though.

[@TehZured]

@@jeffg4008 yeah I agree. I use mine daily but dont typically abuse it

[@itsreallyjakub]

Just luck of the draw

[@browningbelgium2326]

Nice and informative!! I have an 09 Z with a Lingenfelter 660 package and I'm very happy with it. And yes, the heads issue is no issue with this owner. Lingenfelter took care of it all, plus some extra goodies.

[@itsreallyjakub]

Right on!

[@redstang70]

Anyone who doesnt already know about this issue (which has been beat to death for years) where have you been lol? 630 wheel though your car is making some steam! Thats a healthy number for sure

[@therealshizlow]

So I am reading elsewhere from some corvette ppl that the issue has to do with the titanium valves themselves due to the way they wear, not heads. So the issue could be present in an aftermarket head, with the same kind of valves. This vid indicates it's the heads. Which is it? Serious question as it's a lot cheaper to replace valves.

[@itsreallyjakub]

It’s the valve guides

[@MrTrglass]

I have a 2007 z06 with 108k miles. Motor blew at 48k due to valve issue. Crate LS7 has been fine since. Valve issue on ‘06s and early ‘07s is real

[@Tigerchevelle77]

All LS7's friend. My 09 had oblong exhaust valves

[@TheMentalOutfitter]

Can you post your build sheet?

[@derekperkins4141]

Awesome video 🤙

[@MikesLARE]

Never apologize for the noise. Gobless🦅🇺🇸🇨🇦🍁

[@itsreallyjakub]

🫡

[@556suppressor]

That shop is in Canada. I am in the U.S. in the Midwest. Kind of far to drive.

[@RecycledSoul]

C6's...Z06's especially...are demanding SO MUCH MORE than a stock C5 that you can make an ABSOLUTE MONSTER using a fraction of the $ you'd spend on a C6 Z06. It looks SO MUCH BETTER than a C5 in my opinion though. I'd still go C5 with another 200+ usable horsepowercfor the same $. I think they're the best deal right now for building a SERIOUSLY FAST Vette on a budget. Both are great deals and I think they're a good investment. They'll be going up soon. If you're going to get either, now's the time.

[@JamesM-hb2cj]

I love these things but curious … what do you think of the gearing? After your last video I test drove a c6 427 (I’m a convertible guy) to replace my c7 stingray, and the super tall gearing absolutely killed me. Couldn’t get to the top of 2nd on any of the back roads near me. All I wanted was to hear that 7L v8 hit redline and it was near impossible! Curious - does it bother you? I ended up sticking with my c7 because despite the less exciting engine, the gears are way way shorter and that made it a little more fun for me

[@itsreallyjakub]

It’s definitely a bit long but I live out in the country so it’s all good haha. I’ve driven newer cars with longer gears though so these aren’t bad by any stretch

[@JamesM-hb2cj]

@@itsreallyjakub nice. It’s an awesome car man I love the c6z. I will, however, resubmit my earlier request - make a video comparing c6z to c7 GS, would love to see it! Keep up the good work man.

[@SloComaro]

I’m about to regear mine for this reason.

[@JamesM-hb2cj]

@@SloComaro how much does something like that cost?

[@SloComaro]

@@JamesM-hb2cj I havent priced the gears yet, but I got a labor quote of $1,200 because the diff has to actually come out of the car.

[@406gto]

The Z06 is really nice, I would find that exhaust to be annoying after about 30km’s - but hopefully not an issue for you. That colour can’t be beat. 🤘

[@itsreallyjakub]

It’s definitely loud AF. But I didn’t build the car for highway cruising haha

[@406gto]

@@itsreallyjakubyou chose the best colour! Friend of mine picked up a ‘08 Z06 (also yellow) from Legendary last year, and ended up selling it. 🥲. The car was very clean, I wish I had the $$$ to buy it. Hope you enjoy the Z06 - my all time favourite ‘Vette.

[@itsreallyjakub]

Pretty sure I saw it listed recently. Looked super clean. Had all the Legendary photos in the ad

[@406gto]

@@itsreallyjakub yep, he sold it (unfortunately). He has a C7/Z06 Vert for sale. Not as nice IMHO as the C6 he had, but it is clean.

[@robyna8995]

I'm running 15w-50 Motul 300v in my C6 Z06. Great product but no detergents that conventional oil has. Not a cheap oil change! $$$

[@AdrianWyrzykowski]

im looking at 1 of these right now......the head problem is common and legitimate?

[@itsreallyjakub]

Yes. Most of them will likely be fixed by now

[@AdrianWyrzykowski]

Just bought it tonight lol

[@itsreallyjakub]

@@AdrianWyrzykowski yooooooo congrats!!!

[@alabdel1388]

As far as reliability and repairability, are there any concerns you're aware of with any of these '06 to '13 c6 model years? I've been wanting one, but the only thing that would hold me back is any difficulty when it comes to parts and repair if needed.

[@BluMaGiKCj]

The donut things are called “Munchkins” in the USA.

[@SonnyPruitt-q1s]

Everybodys is laughing until the bill comes and then the only one laughing is the shop.🤣🤣🤣

[@dirkx2350]

Tim Hortons are in SE Michigan. I personally think they have some of the best coffee.

[@polywoggins]

We take our C6Zs to the same shop! RR is a great shop.

[@itsreallyjakub]

How many do you have?!

[@polywoggins]

@@itsreallyjakub haha, I meant "our C6Z's" meaning you and I. I have a 2010 C6Z, no cam, all bolt on's. 515whp on his dyno with 93. Autox car.

[@itsreallyjakub]

Ah right on!

[@Goooooo]

1. Love the channel, 2. Not a corvette guy, 3. Watched anyway for Rex content, 4. No Rex this time :(

[@itsreallyjakub]

This car is too loud for Rex. He doesn’t care but I feel bad so I leave him inside

[@Goooooo]

@@itsreallyjakub Real reason I love watching the channel is to get a much needed break from Yuri 🤣

[@apsirotin]

Great video. Ever come across the issue with the check engine light for the gas cap leaking vacuum?

[@itsreallyjakub]

Never had a single check engine light

[@skylineOwnZall]

Eh I know what he says about them not being an issue if installed correctly, but there are years of "fixed" LS7 heads still dropping valves, it is hard to believe that every one of those was installed wrong

[@joeychaseable]

Just budget an additional 5-12K you should be good.... Jeesh! Cool car no doubt. In the back of my mind I'm wondering why with it being GMs "Halo" car they haven't issued a recall if 20-30 or 50% of the cars have issue with the valve seals causing valves to drop and destroy the engine.

[@itsreallyjakub]

Well you could budget for a lot less and fix the issue. But it’s one of those “while you’re in there” you might as well make another 100 wheel horsepower lol

[@Alfrink98]

Hey Jakub, thank you for posting the video. I'm currently in the market for a C6 Z06 and am trying to figure out whether to completely stay away from any that haven't had their heads done. Savagegeese made an amazing video on this car in which they've also brought up the issue with the GM engineers they interviewed. According to them, all of the wrongly machined valve guides were subsequently assigned to a certain batch of bad heads relatively early during the C6 Z06 lifecycle (end of 2006? 2007? They didn't specify this unfortunately). They also claimed to never have actually seen cases of dropped valve heads. Have Nigel or Dave mentioned anything about affected model years? Do I correctly assume that all Z06s built 2008 or later are fine?

[@itsreallyjakub]

They have seen it on all model years and mileage doesn’t matter. It seems to be a complete luck of the draw. Just get the heads fixed or replaced with cast heads and enjoy the hell out of the car, there’s nothing like it for the price

[@Alfrink98]

@@itsreallyjakub Alright. Thank you so much for the quick response!

[@mikec6447]

I am getting that service charging system warning and decent voltage around 14V. What’s that grounding trick ?

[@itsreallyjakub]

Hook up a new grounding wire directly to the alternator on a new chassis ground

[@thecanadiancollector9352]

Not sure if you've ever said what you had for a damper on the engine. Ati makes some very good ones.