i have been trying to search couldn't find anything ...will appreciate replies

My evo head has been decked 0.004" how much compression ratio will it increase if I Had 8.8.1 compression ratio before?is using same thickness gasket as before

Thanks

 

@0.004" you would be lucky to have lost even 1 cc more like 0.5 , depending on the casting the chambers may be within a couple of CCs of each other anyway .
But if you would really like a number for whatever obscure reason.
gen stock gasket head surfaced 0.004 Your compression ratio is now
8.8406/1
Nominal evo chamber is 43cc

 

stock 2.0 at 8.80 will increase to 8.87 by shaving .004 from head.
http://www.csgnetwork.com/compcalc.html

 

thanks guys