Once you get away from 1/16 1/16 3/16 in a big block availability is all over the where. If you want a consistent piston line that's pretty much all you can use. There are some 1.5, some .043 and some you're stuck with a Dykes. Small block, you can do pretty much anything you want.some of the internet forum hacks posting here would have you believe that Scott Shafiroff doesn't have a clue despite the fact that he has built more street/strip and drag engines than anyone else in the country and for longer too and surprise, surprise, the ring package he uses in a pump gas, hydraulic roller cammed, 600hp BBC engine just like the guy that started this thread is asking about is a 1/16", 1/16", 3/16" ring pack and the pistons don't have gas ports either 540 Big Block Chevy Pump Gas Engine
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Not saying that's the reason. The fact is, most people don't need to find 10.5 H/P
Also most volume engine builders, like Gaerte (back in the day) and Scafiroff don't go for all the power they can get. They get reasonable power.....and avoid problems. I'll grant you I only did 250 a year, or so, but I'd opt for something I know will work over a bit of power any day.
Reher and Morrison found thin rings and gas ports worth 40 horserpower, though. So, even in a weekend car that makes a lot of laps a year, there is a distinct advantage in the late model stuff. Just use a .062 port and go have fun.