The cast iron Vortec heads GM part# 12558060 have fast burn 64cc chambers,
1.94" intake valves and 1.50" exhaust valves. Stock semi-dished pistons with
thin gaskets will give you about 9.5:1 compression They do require grooved
rocker arms and the 8 bolt new style intake manifold, and center bolt covers.
GM performance products and Edelbrock make high rise manifolds for them.
These heads offer the best bang for the buck -period. Jim Pace GM parts sells
them new for $418.00 a pair and Burt Greenwald sells them for $395.00 a pair.
I saw a used set sell at auction for about $250.00 I say pay a little more
and get new, thats what I did. -Jeff
'55-2 short/step "Street's Rod-project" (403 HP Vortec 350)
> Hey everyone,
> Anybody know what the chamber cc of the late model Vortec heads would be?
> Also, how much $$$ should I give for a complete new set/ used set?
> 50 & 53 GMC 1/2 tons
> 48 GMC 3/4 ton
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959