Valve Spring Tech Specs and What you Need to know - PAC Racing Springs

Class is in session as Marty Zimmerman gives you a deep dive into the world of PAC valve springs. He's talking lift, height gauges, RPM, coil bind, solid height and much more.

[@mauriceshand2523]

This the type of video you gotta watch more than twice actually understand what he means

[@saadahmad4921]

and the background music makes it worse

[@curtis9918]

Yeah he tryna sound smart rather than educate

[@michaelglenn2106]

I've watched this video probably 20 times highly informational

[@tonkatoytruck]

That was short, sweet, and to the point. Not to mention, very informative. The best compliment I can pay you is to subscribe. I don't need to turn the high rpms for index racing and the limited lift of my heads (.600"), but I since it is a street\strip car, getting more hp with more rpm has a certain primal appeal. No wonder Trick Flow chose your springs in the GenX 225 "as cast" 13.5 degree heads for SBCs.

[@mybelovedson]

this is one of the best videos on what is needed to install the right valve springs and the right way

[@jjmhilu]

Real practical information!

[@basketballcory2]

Good information. Guy doesn't seem to be real friendly, but he sure knows a lot about springs

[@KingJT80]

well hes being honest though. PAC is a good company. but its probably because he gets a lot of budget guys wanting to cut corners then call back asking why they broke a spring or drop a valve. combine that with years of customers calling and you get why he is the way he is. i think hes alright

[@donprather742]

Seems like he's all business.. which is exactly what I want if I'm putting $500 worth of valve springs into $5000 worth of cylinder heads. I'll buy the guy a beer and shoot the breeze with him after the engine is running. Until then, I want to know that my valve spring guy is going to tell me before a f%#& up a nice racing engine. Whether or not he smiles while he's telling me is largely irrelevant.

[@Pktmnstr1]

Heighth*

[@TheCarpenterUnion]

@@KingJT80 he's the kind of guy that makes me end up doing everything myself because they don't want to listen to your opinion or thought process whatsoever. They only care how fast they can tell you you're wrong.

[@KingJT80]

@@TheCarpenterUnion well you still have to remember they design what you're trying to use and have real world results with different combinations in different conditions what you may think work may end up destroying parts. You just tell them what you're doing and what you have and they'll answer your questions

[@michaellorenson2997]

Two days ago, I ordered some PAC 'Hot Rod' SBC springs from Jeg's. It was a pretty easy choice for my application, because no one else seemed to offer what I needed. I'm putting 1.6 roller rockers in an L98, which is a low-RPM engine, and I could probably get away with using fresh stock springs. But I think Chevy probably specs the stock springs as light as possible for fuel economy, so I wanted uprated springs for some valve train durability and stability head room. Shopping primarily Summit and Jeg's, I found nothing comparable from the usual sources like Comp, Edelbrock, or whatever. Maybe I just missed them somehow, but I looked pretty hard and long. Though I'd never heard of PAC (I'm new to the SBC world), I went ahead and ordered their Hot Rod springs. After watching this video, I'm confident in that choice.

[@jeffpeterson653]

Sbc is your downfall. I'm sure you've not enjoyed or experienced anything fast or that actually sounds good. So it's not entirely you're fault. You are forgiven. 🤠

[@ah4800]

​@Jeff Peterson the L98 is legendary. Was smashing 911's in its day

[@hotrodray6802]

Best Ive ever heard 👍👍😎

[@scottworelds2933]

Great

[@georgedreisch2662]

How about a episode on measuring installed height DOHC direct acting (bucket tappets) applications.

[@jeffpeterson653]

I really dig this guys straight forward though guy delivery, I really do! It was straight forward and to the point and tons of energy! He hit on a lot of points very quickly and was very memorable. My only notation is that he said HEIGTH several times....it is HEIGHT!!!!! But I have OCD....so there is that. PAC is my go to for every engine build!!

[@ah4800]

Just got your 1218 for my 03 z06. Sure hope 1 doesnt break

[@johnwehunt4305]

I put PAC springs in all my builds.

[@Anarchy-Is-Liberty]

You're suppose to use them on your valves!!!

[@jeffpeterson653]

I wouldn't put springs just sitting on top of an engine.. probably won't do anything and would be a waste of money.

[@leoamaya1818]

I’m looking to change springs & rockers on my 94 Chevy impala SS. Stock cam & looking to install beehive comps with 1.6 RR. Im very curious & as a mechanic Iv only done this in school. My lt-1 would like a change. 105,000 miles on her & I plan on doing it under the hood. I can’t find any videos showing you on how to do it with the engine under the hood. That tool looks like it would make life easier instead of the one I have. This video is very informative & I just subscribed 💯🏴‍☠️🇺🇸

[@hotrodray6802]

look up putting a 1/4 inch rope into the combustion chamber through the spark plug hole.

[@UncleRodneysPerformance]

leak down tester throws compressed air in there and holds up the valve.

[@slowazbmwkilla3073]

I need some valve spring that will work in a stock ls1 head with ls6 cam . I need a dual valve spring set up for some peace of mind when a spring breaks . Do you have some ? I ask a few shop and they’re more interested in selling me junk that doesn’t work .

[@Strict30]

can this tool be used for small engines?

[@willis23jm1]

I can't make purchase on site?

[@davidgriffin2918]

I have been running 40th to coil bind , been ok for a while now , after watching this I am a little worried, my thought was , closer to coil bind may help against valve spring vibration etc , I wonder if anyone else has done this ?

[@hkpoweralajmi5170]

Hi I have ford edelbrock victor jr and I need springs kit for it

[@CJ5EVOLUTION]

Does PAC fabricade beehive Import springs for 16V 4 Cyl engines Rev 9500rpm for circuit racing NA engine or only for V8 engines?

[@chadbrailer643]

Can you tell me for quads?

[@76629online]

Boing!

[@donesper2070]

Worked at Peterson Spring Southfield plant, made thousands of these springs many years ago, now live in Charlotte NC, was kind of surprised to see a video about them on KZbin, is that a Larson your using there because that's what it looks like

[@jeffpeterson653]

Did you think people would think you were cool and this comment would make you famous? I hope not... because I assure you it didn't work

[@donesper2070]

@@jeffpeterson653 No

[@donesper2070]

LOL, honestly I thought it was cool to work for PAC but I didn't think it made me cool

[@donesper2070]

What you you are suggesting is of course laughable

[@jeffpeterson1957]

@@donesper2070 I was just kidding lol

[@mikeadler434]

👍👍

[@j.arreola8115]

What do u suggest for a stock 2015 GMC Yukon to up grade on sprigs ?

[@Anarchy-Is-Liberty]

Put stock springs back on!!

[@samuelerasmus7415]

Can I run a cam lift of 0.660 when max lift of my spring is 0.660. Or do I need a little safe space like 0.657 lift. Thanks appreciate. Regards S Erasmus

[@nowayjose596]

Yes. It's better to be as close to max lift as possible for springs so that you're (typically) .050 or so (he says they recommend .060 to .080 for their springs in the video) from coil bind at max lift. That actually makes your valvetrain more stable/safer than using a spring with a much higher max lift than your cam has.

[@JH-cb1kq]

It would be extremely helpful if you zoomed in more

[@bwill03z76]

Will the PAC 1219 beehive spring be safe to run with an LS3 BTR stage 2 cam? .620/.605 lift

[@user-jr2gt9nw8b]

They don’t know or care. You better bring all your measurements and hardware or else you ain’t getting any help. Didn’t you hear the little man in the video!!!

[@bwill03z76]

@@user-jr2gt9nw8b lol yea, apparently 🙄

[@aaronburleson2454]

What if your valve spring pressure is to weak

[@seekingsoflo]

Valve float. You’ll lose a ton of power because exhaust can’t escape fast enough.

[@hkpoweralajmi5170]

Hello

[@ercost60]

9:50 "Everybody knows about flat tappets..." What's your theory for the current epidemic of flat tappets & cams? Oil? Zinc? Soft metal? Chinese parts? Bad lifter crown machining? Aliens?

[@KingJT80]

havent seen a lot of failures like this lately. that was a bigger concern about 10 yrs ago. if i do see them someone didnt keep the engine running at the RPM they were told to by whoever sold them the cam

[@tomrose6292]

Ive built many heads and race engines..the "right"spring is what ya gotta have.no body wants to loose a valve in their pride n joy motor due to springs or wrong springs.dropped valves busted pistons cracked blocks ive seen it all.

[@Woaddy..432Hz]

Hey, what about us LT1 GV Silverado guys? Where dem heads cuz! Looks like people holding out on us.

[@kamyarchristopher228]

Unfortunately, the filming was not good.

[@A________]

What about off road guys ?😁

[@Anarchy-Is-Liberty]

What about 'em?... Fuck 'em!!!

[@seekingsoflo]

All depends on the rpm’s you’re pushing and how long you’re holding it there.

[@landonus13]

Definition of the terminology used would help a great deal. Otherwise, all the info anyone could need.

[@CobraR1993]

Tough crowd in here.

[@sexyfacenation]

Is HEIGHTH a word? It is just height right?

[@hotrodray6802]

find a new hobby

[@sexyfacenation]

@@hotrodray6802 you find anew hobby

[@Anarchy-Is-Liberty]

@@sexyfacenation NO YOU!!!!

[@sexyfacenation]

@@Anarchy-Is-Liberty ok. Got me good there. Well played sir

[@brycenbragg5314]

I had to subscribe the scupsctibers were at 666

[@dls951]

Watching Trump peel off HIS accomplishments one after the other, I can help but notice Nancy face is absolutely priceless!

[@michaelslack6891]

Trump sucks

[@v.e.7236]

Dude needs to come over to my garage and burn a number w/ me - and make certain he stays away from the phones. A little too much "customer service" time under his belt (skin? lol).

[@bradleylovej]

100% agree

[@klincoln80]

Great information, but it seems like you are being forced to do this video.... also, heighth is not a word.

[@FABRIC8TIONUNLIMITE1]

"Valve stem installed height is the measurement from the tip of the valve stem to the valve spring seat or cup. All valve stem heights must be within specification. If one valve stem is higher than the others, suspect that the valve face or seat is worn. A valve stem height gauge may be required to measure this height."

[@cattcatt7440]

He’s pissed it was his turn to make the video.....lol

[@inscoredbz]

My cam is . 540-.560. I'm looking at 1218 & 1219 springs. I like the higher seat pressure of the 1219, but would I be better off with the 1218 shimmed tighter than the 1.8 installed height PAC recommends to get closer to coil bind for more pressure on both the seat and over the nose? How do you use the spring rate to figure spring load at a specific lift?

[@JustinMorrisV82]

Spring rate is normally in lbft per inch

[@KingJT80]

spring rate X full camshaft lift (i.e. .540-.560) + installed seat pressure = open pressure at specific cam lift

[@KingJT80]

1218 spring 313 spring rate X .560 lift + 130 seat pressure = 305 open pressure @ .560 lift

[@mrnicktoyou]

Very passive aggressive. Relax a little my man.

[@TheJohnsmith133]

This guy's being quite ridiculous. He makes it seem like the last thing you need to complete your build is valve springs. The average Joe engine builder, like myself and alot of us, wouldn't know alot of this information that he's demanding. It makes it intimidating to call in to their tech line and sound like a moron because they're asking questions that only the guy at the machine shop will know. Stop being so full of yourself and sell your product.

[@ppatricktt]

Or why dont you learn a thing or two in order to be a better back yard engine builder

[@bradleylovej]

Yeah, I agree with this take. That's the problem with a lot of guys that have really specialty knowledge. For some reason they have this undercurrent of hostility. It's like, relax dude. You're just selling springs. Not everybody went to "spring school." So why don't you just dial it back about four notches and talk to people like you respect them, even if they aren't at your level of technical understanding in the field you specialize in.

[@jamesmedina2062]

@@bradleylovejbut this isn't a salesman here dumping sugar on you. This is tech.

[@jrhansen1997]

Blah blah blah blah blah ...