Hi, i have ls6 engine with .020 pistons and 799 heads milled about .020 with gm MLS head gaskets , in my 96 impala , now the engine is in the car and i'm looking to get a mail reflash service this week to start the engine and i have no idea what compression ratio my engine has , i don't know how to calculate it since every thing is assembled. so any help would be much appreciated
thanks guys

Jack

 

If you milled .020" off your 799's They would be approx. 62 cc, if it helps.

 

so that makes them 10.8 CR ?

thanks man