Advice Wanted...
Thread Starter
Teching In
Joined: Dec 2011
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Advice Wanted... Merry Christmas everyone;Thanks for reading.I have a ls4 with 35,000 miles that i am building, plan on mating to a f40 6 speed in a fiero. So far, i have a set of fully ported 243 gto heads shaved 012 (63.5)with oversize ss valves,650 lift pac springs,an ls6 intake w tb,injectors complete harness from a zo6, lingenfelter dod delete kit with 3 bolt cam conversion,ls7 lifters and katech hp chain and aem intake. I am probably going with a custom grind cam,maybe lt custom headers. I am thinking about dropping the compression with a set of forged pistons, changing bearings and adding a turbo with about 7 psi. If i do this i think i can use the stock exhaust,fab an adapter for the turbocharger,match cam, but i will need larger injectors.Or Either shaving the heads a little more,bumping the compression up,match cam accordingly,add ltubes, use everything i have with stock bottom end, maybe nos. I am porting the tb,intake and polishing the exhaust side either way. I would like my build to be cost effective, use pump gas and have some street manners/reliability. What do you guys think? I am completely open to other ideas. Greatly appreciate the advice as I can't decide
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. Thread Starter
Teching In
Joined: Dec 2011
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Thank's,for the reply,that is what i would really like to do,but finding a set of 3.78 low compression pistons seems impossible.I think the crank is strong enough,i am not sure about the rods,but i think im at the limit with the stock pistons.
Thread Starter
Teching In
Joined: Dec 2011
Posts: 5
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Honestly turbo seems like a winner but i am terrified of pre detonation,without it i will use longtubes.I am curious of the strength of the stock ls4 pistons and rods,because i will bump up the cr.I am going to balance the crank,pistons/rods either way,thinking about boring to std ls1 just for forged pistons.I see some are using 4.8 pistons to increase compression,but if the stock piston/rods will handle 10.5 it would be a waste of money.I wanted to get around 500 to the wheels,but i am more concerned with reliability at this point.
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