[Hillard]

Originally Posted by mgarblik

Nitro Pontiac= 2420 grams 4.250 bore. BME 426 forgings, 1.094 pins, Big, thick BME pistons. Strength over weight. 8500 RPM. .Rods 6.7" Piston weight 630 Grams We overbalance 1%

When forcing nitro in, you definitely consider strength over weight. Your pistons are almost 200 grams heavier than mine, but mine wouldn't last for a burnout in your application.

[mgarblik]

Yea, you do need the extra weight in some power adder applications. When we were first working the tune-up a couple years ago we bent one of those 1.094 VascoJet wrist pins. I couldn't believe it!. It was bent .003" The flat top pistons are almost .400 thick. As far as pistons for NA and high RPM Pontiacs, Because of the short cylinders, I would try to keep as much structure and support in the skirt area as possible. Certainly around the pin boss and the underside of the piston, they can be light.

[Bob-o]

eagle 6.8 rods, probe 4.155 pistons, 2160 Bob weight