KB HyperT's?

I ran KB's (KB107) in a 360.
Lasted 5 years before one came apart, killing the cylinder & Eddy heads.
It had seen maybe 10 shots of NOS (125hp) over its lifetime, it had 925 passes on it.
I planned ahead on the NOS shots with a different tune.
The start of the 2012 season, I ran a leak-down (5%), all good.
The first race of the season, it ran as fast as it ever had & blew up after the run.
If I had it to do over again, I would have went with a Forged piston.