I don't plan to run an evac system since this is a 99% street motor. It definitely makes sense that thinner rings = less friction. I've got 1/16", 1/16", 3/16" rings in the current engine with "low tension" oil rings. I swear my rings took 5000 miles to seat! One of the rings is chrome molly, if that matters.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"