[Alan Roehrich]

We were spinning heavy components higher than that not to many years ago. People think it can't be done now because so many light components are common now.

If you're using really good connecting rods and wrist pins, the 396/375 piston is not that heavy.

If you're using a poured and sleeved 454 block, or better still, a Dart block, the block is no problem.

A good steel 396/427 crank is pretty tough, there is plenty of journal overlap, and if the block isn't moving around, it is not likely to break.

If you're not spinning a 396/375 up pretty tight, you're probably not going to go very fast.