I've learn that wider end gaps are way better than a tiny bit, even .000010, to tight will kill parts whiney
I am not a fan of cast hyper type pistons either down
Forged pistons live longer with the same abuse twocents work
I do know that there are no parts made that can't be hurt by the right, parts killer customers, persons shruggy
I thought I remember reading the instructions on a set of the early KB hyper pistons saying to open the 2nd ring gap way up, not the top ring confused

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)