Compression on a Lq4 with Ls3 heads
Compression on a Lq4 with Ls3 heads If I want to get to 11.5 compression how much should I get my stock brand new ls3 heads milled by? I have Wiseco -3cc flat top with valve reliefs cut in. I also think I could get a thinner gasket so I only have to mill the heads a minimal amount.
Assuming you have the 4.030" bore pistons for that 408ci and the piston at 9.235" zero deck, to get 11.5:1 static compression you could go 66cc chambers and GM MLS gaskets, or .040" gaskets and 68cc chambers.
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You'll mill about .010-.015" to net 68cc chambers on a stock LS3 head.
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When you have your machine work done, some blocks will need the deck surfaced decked more than others and some builders won't touch them at all even if they need it. That will affect the piston to deck height.
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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!
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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