Sierra RST Stock 4.8L Turbo: 617HP/623TQ
09-06-2010, 08:49 PM
#21
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Join Date: Nov 2004
Location: BR LA
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The 6L heads your speaking of are 317's I assume? I am in the process of rebuilding a 4.8L that I'll be sticking a turbo on and was wondering what the comp. would drop to with 317's over the 241's I have since they flow better and that sounds right around where I wanna be.
