Vortec head castings

[bucket]

I've heard it for years and I still hear it often, the 062 casting is the good one and the 906 casting should be avoided. Has anyone personally found any truth to this? If it's true, is the 906 casting still far better than stock swirl port heads? I would think so.

I can possibly score a set of the 906 castings for dirt cheap, but I don't know if they are worth messing with. At a minimum they need resurfaced.

And where did Curt's sticky thread go? Am I just overlooking it?

 

[RetroC10Sport]

http://www.gmsquarebody.com/forum/showthread.php?t=1594&highlight=vortec

 

[crazy4offroad]

906 I believe is the truck casting, and much more widely available. The 062 is the earlier '96-'98 Caprice/Impala SS heads I believe. As far as one better than the other I've heard it too but I think it's just an old wives tale.

EDIT looking at that link again the 906 came with "an Inconel exhaust seat with single angle valve grind and was available on 1 ton trucks. The other version was the traditional three angle valve grind. Other than that, the #906 is the same as the #062 head."

 

[bucket]

Yeah I just read that part, I can check that fairly easy I guess with a valve spring compressor.

 

[Jims86]

Yeah I just read that part, I can check that fairly easy I guess with a valve spring compressor.

You can use either head. You won't get close to the full flow capabilities, regardless of casting, even with a hot cam.

 

[HotRodPC]

FYI for future, It's a Sticky in the Engine Swaps Category. Not sure if I was tired that night, probably just seen Vortec and moved it into swaps. It kinda is a swap though.