help with compression
Patrick G please help me! Ok, I have a set of heads that are going on my car. they are milled to 60cc's. I run a G5x3 on a 112 and would like to get the most out of it. I would like to run pump gas in my car unless it gets really hot out. I am stuck on what sort of gasket I should use to optimize compression, quench, and detonation. any help is great! also what is the norm for max compression street motors?
Last edited by yak; Oct 16, 2006 at 07:46 PM.
The tighter the quench, the better your motor will resist detonation. As long as you don't run into any piston to valve clearance issues, I'd recommend going with a Cometic .040" head gasket. It's what I run. No problems with 93 octane for me! 30 degrees of timing and a DCR of 8.73:1! 
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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From: Norwalk, CT
Originally Posted by Patrick G
The tighter the quench, the better your motor will resist detonation. As long as you don't run into any piston to valve clearance issues, I'd recommend going with a Cometic .040" head gasket. It's what I run. No problems with 93 octane for me! 30 degrees of timing and a DCR of 8.73:1!
Originally Posted by Dave88z
So what is your quench spec and what are the limits for a street car or a weekend warrior? I have heard some say .035 for a street car is as tight as you should go, others say .030-I guess it depends on application. Sorry to jack the thread
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TECH Senior Member
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From: BFE
Good, then you can run a nice tight set of Cometics .040
Shoot for 11.35 SCR, if your cam is a 112+4 you'll be in the 8.6 DCR territory and you would have optimized your combo.
I think 2 cc reliefs might do it (not sure though)
Shoot for 11.35 SCR, if your cam is a 112+4 you'll be in the 8.6 DCR territory and you would have optimized your combo.
I think 2 cc reliefs might do it (not sure though)