[Marshy]

Originally Posted by lil hoodlum

I purchased these Vortec heads because they are suppose to accept either the vortec style intake manifolds or the earlier non-vortec style manifolds.



Here is a photo of a early non-vortec intake manifold gasket on the ProMaxx heads. As you can see the gasket doesn't cover and seal the taller intake ports.

Does Promax recommend a specific gasket for these heads? It might be worth a phone call to them to ask. It looks to me like you need the traditional Vortec lower manifold gaskets.

I agree with the other comment about your compression. Do you know the deck clearance or the piston relief cc? What head gasket are you planning to use?