Generation IV Internal Engine - ok so my compression is? l92 related




89Formulaws6
03-24-2008, 08:36 PM
i got my cam sepcs but they are :secret2:

but i have a 4.030 bore 4in stroker 1.8 valve reliefs, my pistions stick out the bore .012 and i'm going to use the ls7 headgaskets since they are cheaper then cometics but they are .052 compressed from what i've been told.

so that puts me around 10.7:1 correct? now is wanting 11.4:1 at most asking too much for a street car on 94 octane?

because my tuner told me 11.4 is what the heads like and somewhere around 30* of timing will i be able to get that many * with that compression?

so if i need to mill my heads to get 68cc's even to get 11:1 i'd be happy

how much off of the stock 70cc is it to get to 68


95FbFormula
03-25-2008, 12:26 AM
milling .030 gets 65cc so something like .010 will net you 68cc you can go to 65cc or farther I am going with 65cc on mine. if 68 will get you 11-1 65cc should be about 11-5

WKMCD
03-25-2008, 05:43 AM
Use .006 mill per cc to calculate.