I worked with Marko, with a "k", back in the early 80's Sharp guy.
Ring gap is the deal on hypers. The pistons will take a 150 shot pretty easy as long as you have a good tune up, not the real fat, junk jet recommendations in most kits.
I requested max gap on my hypers to my builder. Piston to wall clearance im not sure. Builder had pistons in hand before machining to bore appropriately w knowledge the motor will be ran hard.
Good to hear some success on 100+ shot without immediate piston failure. :)
Once new motor is installed I will gradually work my way up on jetting. Hope it runs great w/o the juice. Few of my key parts came from and recommended by Brian. :D
