If you have to spend more than $600 on a refresh, then you must go Aluminium.

But I would never spend time and effort on a 516 anyways!

I have wrecked several pairs trying to get the exhaust ports 'into shape'. sawzall ozbbq

Some are cast with the very bad roof port bulge that cannot be enlarged.

But I recently came across some 516 castings 1964 and 1965 that have the later style '915' 'LARGE' exhaust port, go figure? realcrazy

All the 1966 heads that I have ported and subsequently ruined have the collapsed roof...

So I cut my old 1966-516 race heads up to see why?

I'm guessing its a 'foundry flaw' with damaged casting-moulds from 'over use'...

Pictures to follow for anyone who 'maybe' interested lol... fan

Last edited by Gtxxjon; 12/16/21 08:11 AM.
Carpe diem, quam minimum credula postero, thanx Horace!

There’s no point trying to fix stuff that ain’t broke,,, 'but if ain’t broke',,, you is not trying hard enough...