lq4 build questions
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lq4 build questions So I'm rebuilding my lq4 in my truck and looking for advice. Its stock crank and rods. I had it bored .20 with flat top pistons. I have an Vinci cam "the trucker". But my question is do I run the 317 that are all reworked or my 243 that have about a 1000 miles on them. They both have GM performance valve springs. I all ready bumped the compression up some with the flat tops. Do u thunk the 243 might be to much?
When you say flattop pistons, you mean no valve reliefs at all? Usually you'll have -3 or -4 valve reliefs which makes a difference in CR. With no relief at all, you'll be at about 11.1 CR with the 243 heads (more like 10.8 with 3cc valve reliefs). The 317 heads will drop CR pretty low unless you have them milled.
Between those two options, for an NA or nitrous combo, I'd go with the 243's!
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There are quite a few variables that go into that number, cam specs, altitude, fuel, and tune just to name a few! Many will draw an imaginary line around 11.3-11.5:1 for static compression and pump gas.
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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!
