[undy]

If the motor's pulled down FOR ANY REASON then the block should be sonic checked for cylinder wall thickness. I know a bunch of top-o-the-line machine shops that know squat about FEs. They think everything can be punched out 0.060" like BBCs. Like Barry said, a half fill of hard-block can take care of a lot of cylinder instabilities. It's not only overheating that's the issue. I thin walled cylinder can move around and distort causing not only overheating but loss of ring sealing and excessive blow-by.