58cc compression ??????
58cc compression ?????? my cam is 240/244 608/598 on 112 +4 58cc 5.3 heads 2.02/1.6 what heads gaskets can i ran,and be safe on 93 octane? .040 or .051
need in fo plz!!!!
plan on flycutting bout .080 stock ls1 block
need in fo plz!!!!
plan on flycutting bout .080 stock ls1 block
Last edited by johnster; Jan 22, 2009 at 12:21 AM. Reason: bvbb
Estimating that your flycuts will result in 1cc of cylinder volume, here are the calculations. The .052 calculation is based on the GM 6.0L MLS gasket, the .040 calculation is based on a Cometic gasket.
.040 Calculation:
.052 Calculation:
DCR numbers are NOT CORRECT, I DID NOT calculate IVC. Is that a Comp Cams grind?
.040 Calculation:
.052 Calculation:
DCR numbers are NOT CORRECT, I DID NOT calculate IVC. Is that a Comp Cams grind?
Last edited by 405HP_Z06; Jan 22, 2009 at 10:19 PM.
I would go with the .051 gasket. Even with .080 flycuts, you're gonna be close with that size cam and a 58cc chamber. ALWAYS check PTV when doing a setup like this, assuming things can cost you a motor or bare min a set of heads.
Check PTV you might even be able to get away with less then that, leaving a little more strength in the piston. My personal clearance was 0.045 with a .056 gasket, 59cc on a stock exhaust valve with 242* of duration.
Eric
Eric
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i started cutting to day i was planing on only cutting the intake valves, well tps said i would be ok with the .040 gaskets even on a 100 shot, cents i was flycutting
what yall think? i going to check ptv
what yall think? i going to check ptv
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I have 59cc 5.3 heads, 2.02 valves, 240/244 111 XE-R cam, with .040" gaskets. My comp calculated to 11.67 SCR, 8.77 DCR. It runs beautifully with no KR on 93 octane and no drastic cuts in timing.
I cut the pistons .100" deep to achieve .090" p/v clearance to the intake valve. (didn't have to cut for exhaust valves)
I don't think .080" flycut will get you enough clearance.
I cut the pistons .100" deep to achieve .090" p/v clearance to the intake valve. (didn't have to cut for exhaust valves)
I don't think .080" flycut will get you enough clearance.
im running 58cc heads. 226/230 .609/.588 cam, stock MLS gaskets and I didnt have to flycut. My compression is 11.6:1 and my DCR is right at 8.9:1. I have to run 93 octane, 91 gives me KR if im ragging on it. I had atleast .110 on intake and exhaust for clearance. I stopped checking once I established I had atleast that much.
Guys. Stop wasting your time worrying about useless formula's like DCR, and spend more time matching your combo together. IE: The heads/cam matching, valvetrain geometry, etc.
I've never once bothered with DCR, and never once have I built a weak engine.
I've never once bothered with DCR, and never once have I built a weak engine.
IMHO, its just another number. 
