First thing I’d do before getting excited about the 516’s is cc a couple chambers.

I’ve seen unmolested ones measure in the 84cc range, so it’s not like they’re a guaranteed big boost in cr.
The closed chamber buys you nothing with quench on this build, so no benefit there.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads