[Mike Taylor 3601]

I calculated it 3 ways If you have regular cast pistons like federal mogul 436p the compression distance is .020 shorter than oem piston, the shorter ones will be 1.540 comp.distance. most hypertec. and forged will be 1.560 comp. distance.

Here's the 3 ways I figured.
Block not decked 9.025, w/-9.92cc dish/valve pocket,56cc head,.039 X4.100 head gasket,.045 deck clearance,which will be close to what you have w/9.025 deck and 1.540 comp dist.
will be 9.7-to 1

w/.025 deck clearance will be 10.15-to 1

w/.000 deck clearance will be 10.8-to 1
You probaly will have the same as one of these combinations depending on comp.distance of pistons,and deck height of block.

I would want it to be 9.7 or less for 93 pump gas,also is less likely to detonate if piston to head clearance is not over .040.

If you have'nt cc'ed head it may be 3-6 cc bigger than it is supposed to be.It takes
about .007-.008milling to remove 1 cc.
If it was me I would use 76cc heads w/zero deck and flat tops or use dish pistons w/305 heads
Mike Taylor 3601