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I used the Hooker Cast Iron headers/manifolds in the pictures below on my '67 Panel Truck with an LS1. Cleared everything with no problem. I bought them off of E-bay.
It looks like these might be about the same and on sale..
https://www.holley.com/products/exha...st%20Manifolds
You have to watch that price. That is per manifold. I don't think I have ever seen anyone sell them one at a time....
... Any way it automatically added 2 to my cart. Dunno.
LockDoc