Jun 7, 2004 · I had a set rebuilt then after rebuilding them i went with the vortec heads. better flow, better chambers, after modifying the springs you can run a higher lift cam. and they are …

Nov 29, 2003 · The 624 heads are among the worst of the worst. Don't bother spending any money on them. As already referred to, they are highly prone to cracking in critical places, and …

Nov 12, 2012 · Well, there's good news and a little bad news about these heads! The Good News; Chevy used these heads from 1976 to 1987 on 350 cid engines. They were fitted with either …

Dec 6, 2011 · By "heavy casting", I mean it is a good thick casting not prone to cracking, like the 882 or 624. Definitely keepers.:yes: The trick here will be to see if a hardened exhaust seat …

Nov 12, 2014 · ive picked up a side engine project, just a 350 with typical 76cc 624 heads, had a set of 081 heads and always wanted to try porting and polishing so bought a few bits, stones …

Dec 23, 2006 · #462624 is a late '70-mid 80's 350 head, small valves, large cc. chambers. They are thin castings and prone to cracking.

Jan 9, 2006 · Before the advent of the Sportsman II heads around the late 1980's the 993 was used by John Lingenfelter and other engine builders extensively for street/strip engines. At that …

Mar 5, 1999 · What makes Vortec heads any different from other GM steel heads? Pretty much everything. Beginning with the intake port, which is 170cc with a cast-in 'ski jump' on the port …

Aug 11, 2009 · My current setup (#624 smogger heads) has static compression of around 7.7:1 and dynamic compression of around 6.1:1. YIKES!!!!! I want to have a static compression as …

Mar 23, 2004 · I like the small chamber heads myself but they must be ported. I have ran ported "76cc" heads many times and milled them all .030" The 305 engines heads always made more …