Cam size without Pv clearance issues
Thread Starter
10 Second Club
iTrader: (21)
Joined: Mar 2004
Posts: 808
Likes: 0
From: Ft Lauderdale, FL
Cam size without Pv clearance issues What is the largest cam with a ls1 stock shortblock with 66cc AFR 205 heads unmilled and cometic gasket with an .030 gasket that I wont run into piston to valve clearnce issues? Thanks.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by Spinmonster
My C5 has .027 gaskets for 11k miles now.
And Spin, why don't you tell him what setup you have and why you're running such a tight gasket!
TECH Enthusiast
Joined: Sep 2003
Posts: 730
Likes: 66
The .021 quench was definitelt not the norm. The motor is all forged 348 and N20. It is a max effort motor and I wind it to just under 7K.
Input came from my uncle on the build as he is an engine bulder for over 30 years.
When you say 'the norm', it is generally accepted outside the LSX forums that .020 is the minimum but on these forums a few builders got it in their heads that .030 is the minimum and is law. Who is to say. My 11k on this build is a very abusive 11k and there is definitely not any carbon build-up in there like the stock set-up had...maybe from the nitrous?
Anyway, just offering what I have for statistical referece or you can just discard it as useless. A properly built motor can do things a patchwork motor can't.
It is my understanding that cometic no longer makes the .027 gasket since no one uses it. I asked why they made it in the first place and they said .020 was acceptable. The minimum is now .033 which is fine with the stock.006-.008 out of the hole piston.
If my set-up didn't blow up by now it is fine. I had the heads off twice to do some head work and all is fine in there.
I went with .040 on my C6 since the displacemnt put me at 11.4:1 and that is where I wanted to be.
Input came from my uncle on the build as he is an engine bulder for over 30 years.
When you say 'the norm', it is generally accepted outside the LSX forums that .020 is the minimum but on these forums a few builders got it in their heads that .030 is the minimum and is law. Who is to say. My 11k on this build is a very abusive 11k and there is definitely not any carbon build-up in there like the stock set-up had...maybe from the nitrous?
Anyway, just offering what I have for statistical referece or you can just discard it as useless. A properly built motor can do things a patchwork motor can't.
It is my understanding that cometic no longer makes the .027 gasket since no one uses it. I asked why they made it in the first place and they said .020 was acceptable. The minimum is now .033 which is fine with the stock.006-.008 out of the hole piston.
If my set-up didn't blow up by now it is fine. I had the heads off twice to do some head work and all is fine in there.
I went with .040 on my C6 since the displacemnt put me at 11.4:1 and that is where I wanted to be.
Last edited by Spinmonster; Dec 22, 2005 at 01:42 AM.
Trending Topics
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Oh yeah, nitrous will clean things up pretty well.
BTW, let me emphasise that tight quench will not produce more carbon, but i mean't street driving with stop and go and lots of idling. This in turn, at the long run might cause some clearance issues from carbon buildup.
And Spin, You said nothing wrong, I just wanted the guy to get a clear picture on why you would run such a tight gasket.
BTW, let me emphasise that tight quench will not produce more carbon, but i mean't street driving with stop and go and lots of idling. This in turn, at the long run might cause some clearance issues from carbon buildup.
And Spin, You said nothing wrong, I just wanted the guy to get a clear picture on why you would run such a tight gasket.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
now back on topic, the g5x4 clears stock heads, the trex is made for stock heads, the magic stick is big, f15 ron jeremy is big, my cam in sig is big. there are many big cams out there that clear the stock heads. if you want a bigger cam that still makes a little power down low, a g5x2 is great, and so is an f13, or f14.
Originally Posted by LSXRX7
So does any one know what's the most lift you can go with on a LS1 or LS6 with stock heads? just wondering... 
Thread Starter
10 Second Club
iTrader: (21)
Joined: Mar 2004
Posts: 808
Likes: 0
From: Ft Lauderdale, FL
Thanks for all the information however I am running the AFR 205 with a 66cc chamber and the 2.02 valves. I understand it is hard to give a "this is how big you can go" so is there anyone with this set-up running a big cam on stock pistons? and if so what cam? Thanks.
