[DAVID GAGNARD]

The cylinders are not as "deep" as on a standard factory block....for up to 3.4 stroke, there is plenty of clearance....
On my original engine, I was using a factory block and had to notch the bottom of the cylinders for rod bolt clearance on a 331, 3.25 stroke......

Cylinders are quite a bit thicker than a factory block, you can go to 4.125 bore with this block.......

David