273ci thoughts?

toolmanmike said

I wonder if @AJ/FormS has done the numbers there? KB-167's or similar or the 85-87 lean burn Sealed power pistons should end up with around that 9:1 compression mark with the 67 closed chambered heads. They are probably #920's and are very similar to the #302's that came on the lean burn engines. Oops, NM9 already commented on that.

Click to expand...

There ya go..... roger, a flat top piston .070" in the hole cannot match the CR of an eyebrowed piston .012" in the hole. 0.6 points higher with the KB's all else being equal. Plus the piston in the hole can' have quench and won't have the valve clearance. But the 526AP's are a $500-550 + or - cheaper route in the 318, once you factor in the piston cost and balance work for the KB's. (You can do it for < $350 difference with the right local shop and some info.)