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this is a 2.5 turbo common block

both the head and the block have been surfaced. lets say .010" each.

the pistons are oversize cast mahle, 0.030"

anyone know how i can figure out my new compression ratio?
 

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Compression ratio is figured out by= (cylinder + chamber volume) divided by chamber volume. That's the formula in Mopar's 2.2, 2.5 FWD Performance manual- chapter 13 Racing formula's. That said, you'll have around 8.3 w/o the shim.
 
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