I have not degree wheeled the tighter lash spec. Not sure how I would do that without pulling the front end off my 40 Chevy and disconnecting the AC.
The Isky cam spec. shows the 264 deg. adv. dur. is at 0.020 lifter rise, and 228 dur. at 0.050 lifter rise. These figures might be helpful in figuring out what a few thousandths less valve lash might do to the duration.
Or, I could just experiment by running with say 0.015 valve lash.
