Originally Posted by KyleG
I dont think the heads are shaved any, and stock spec head gasket. Filled up on regular and can't tell a difference. So probably around 9:1 thankfully lol
You have a 1 point range of between about 9.2 and 10.2:1 depending on the block deck, gasket thickness and whether the pistons are 1.56" or 1.54" compression height.
The problem at the low end of the CR shown is the quench distance will be VERY wide (as much as 0.086" w/a 0.045 piston deck caused by a rebuilder piston combined w/an unmilled deck along w/a 0.041" gasket thickness).
As long as it'd not detonating, at least it shouldn't beat the bearings out of it or pinch a ring.