200block with 7.2 comp pistons and rwd head, what comp would that give? since i figure the piston comp is calculated for a 4x4 head and the rwd head has larger cc right?

 

If the pistons are for a 4x4 application then yes the cr will be lower on a 2wd head..
A 2wd head with std deck hieght on a std 4x4 spec bottom end goes down from 8.1 to around 7.8.1 iirc
So if your head has good meat on it(std for example)then your cr will be around the 6.9.1!!!
And imo thats way to low,i dont like to go below 7.5.1 these days and even prefer nearer to std for most apps...


cheers danny

 

Thank for your reply!