Rebuilt 302 casting heads available through Rockauto

MOPAROFFICIAL said
Dang George,
Check it out...any closed chamber head takes less timing than an open chamber because with an open chamber=more area=needs earlier ignition to burn it in the same amount of time . Flame travel . A to b , now shorten the distance, hence fast burn. When they say fast burn, that's because the chamber is smaller, more compact, less distance to the plug everything's being shoved towards.

I am liking that, got the 516 closed chamber heads, now with hardened exhaust seats too on this 67 383 Factory 4 bbl engine that is sitting here.