[DavidNJ]

If going 'custom', the lighter piston/pin weight would make a smaller rod journal/cap/bolt possible, or at least safer.

Also, Big block stuff can be heavy so there is more weight to save; maybe 300-500gm vs 100-150gm in a small block. And the high power can result in high engine acceleration rates (> 600rpm/sec). So the lighter stuff can add 5-10lbf-ft torque and 10-15hp from lower inertia. More than a small block.

Barry, since your a ring guy (I believe Barry was the top guy at one of the major manufacturers), what about the LS1s using 1.115" comp heights on all their 4" stroke stuff? What would your recommended ring package be, in terms of ring size, ring spacing, tension, and gas porting?

Note: my power estimates are from calculations and not dyno tests.