Hi, I've read somewhere that Vortec 062 heads flow better on exhaust than 906's, is that true? Is there any other V. casting which's better for performance applications?

Mike

no that's not true. they all flow the same.

that's from CHP Magazine:

For you junkyard hunters, be forewarned that some ¾- and 1-ton trucks came with Vortec heads equipped with a specially hardened exhaust seat that kills low- and mid-lift flow. Casting number 10239906 should be avoided.

im pretty sure they retracted that statement

yup, do a search there was a big discussion on that topic before, CHP later admitted they were wrong with that statement and took it back. its completely untrue.

didn't do my homework before posting - found everything in old threads... thanks guys!