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ok guys, i need some help with CR and boost on race gas, max effort!!!!

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Old 12-23-2009, 09:36 PM
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Default ok guys, i need some help with CR and boost on race gas, max effort!!!!

ok, i really want to push this and see what it can do! i bought some AFR LT4 220's and now i need to change my pistons to get my CR down! my question is what do yall think the best CR is?

385 lt1
not solid roller so wont be goin over 6500 or so (stock computer)
race gas only, 109 or so (still running o2's)
th400
i really dont want to run more than bout 20 psi

oh also im guessing its best to run the thinnest head gasket possible right?

so give me your answer and reasoning! thanks!
Old 12-23-2009, 09:50 PM
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Whats your CR on your motor now?
Old 12-23-2009, 09:59 PM
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Originally Posted by 4SFEDZ
ok, i really want to push this and see what it can do! i bought some AFR LT4 220's and now i need to change my pistons to get my CR down! my question is what do yall think the best CR is?

385 lt1
not solid roller so wont be goin over 6500 or so (stock computer)
race gas only, 109 or so (still running o2's)
th400
i really dont want to run more than bout 20 psi

oh also im guessing its best to run the thinnest head gasket possible right?

so give me your answer and reasoning! thanks!

That's a question with lots of variables but I would go with 9.1 which would be safe at that boost level and race gas. Of course that's completely based on a good safe tune.
Old 12-23-2009, 10:02 PM
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well its suppose to be 8.5, but the new heads are a much smaller combustion chamber. so i need to get new pistons and just trying to get the most out of it!

and ya my tune will be spot on! lets hear it BlwnTA!!!!



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