Lets see, an 11.25 block height minus 1.9 (half the stroke) is 9.35 minus the connecting rod length is 1.785 for the piston compression height. If you want a 270 crank, I'll trade you the 248's for it. Just check the cylinder wall thickness before you bore that far. I went through all this when I put Jimmy rods in an over bored 261. Ended up using Buick 181 pistons.
