Smallblock Pistons: 1 question.....KB's -or- Sealed Power(SpeedPro hypers)???

I completely disagree cast pistons cannot take abuse. It's just not true. The vast MAJORITY of engines left the factory with cast pistons. Personally, I've had over 300 cars and a LOT of them had factory cast pistons and I abused the HELL out of all of them. So have millions of other people over time, so you can flush that stupid opinion right down the toilet.

Can they take large doses of nitrous for long periods? Of course not. Are they good for forced induction. As a rule of thumb, no, but I've seen people use them with success with both forced induction AND nitrous. The key is all in the tune and knowing when to LIFT your right foot!

All that said, IMO, unless you want to mess around with the special ring gaps the KB pistons require, use the Speed Pro pistons. They do not require the special ring gaps the KB pistons do.

If the engine is tuned and built well and USED with the intent IT WAS BUILT, it will be perfectly fine.