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

Speed Pro's like the H116CP are hyper's like KB's. Icon's are forged. ICON FHR's are lower cost forged.

I've raced a long time on both hypers and forged (rallying) with 14-15 psi boost so they can both last well. Forged MIGHT save you from a broken piston if you get into detonation versus a hyper.... but I say MIGHT. I've broken/melted ring lands out of some stout forged pistons when detonation reared its ugly head. For what the OP lists as a use, I would not be scared to go with a hyper.

The KB's will require you to re-balance the crank as they are quite a bit lighter. The Speed Pro's are usually stock weight replacements. Most everything else will require a re-balance. (Unless you get clever with wrist pin weights.)

We went with KB hypers for my son's 340. All street... just for fun and horsing around on the mountain roads. Pay close attention to the top ring gap instructions on the KB's if you go that route; the top ring gaps are a bit wider than typical due to the high position of the ring on the piston.