ADVICE NEEDED: 3.905 vs. 3.910 Head Gaskets?
#1
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ADVICE NEEDED: 3.905 vs. 3.910 Head Gaskets?
I was told to go with Cometic gaskets for my setup and I found a couple: 3.905/.045 and 3.910/.040. .040 is the stock thickness right? but the stock bore is 3.905? Id like to know which one would be right for my setup and why:
-LS1 Block
-249/254-.617/.619-112lsa
-Polished GM Crank
-Probe UltraLight 6.125" Forged I-Beam Rods
-Ross 3.905 Forged Pistons -4cc
-Total Seal Advanced Profiling Rings
-200 shot plate system
-LS1 Block
-249/254-.617/.619-112lsa
-Polished GM Crank
-Probe UltraLight 6.125" Forged I-Beam Rods
-Ross 3.905 Forged Pistons -4cc
-Total Seal Advanced Profiling Rings
-200 shot plate system
#6
LS1Tech Premium Sponsor
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It really wouldn't make any difference on 99.5% of the builds on this site. We stock the 3.910" bore gaskets from Cometic at competitive prices. Let us know if we can help!
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Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
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#10
TECH Senior Member
Yes, aggreed with Vettenuts and JPH, and there is also another thing you need to check, you PISTON DECK HEIGHT. It is an aftermarket block, pistons could be .010 out and with .040 could be too tight a quench at .020, then you might need thicker gaskets.
Find out what is your piston position in/out of hole, then make your decision .030 circle bigger than your bore.
Find out what is your piston position in/out of hole, then make your decision .030 circle bigger than your bore.