[Michael C Henry]

The top rail that the valve cover seals against should match. My heads were shaved and the rails didn't match . I ended up having the manifold shaved to match .Gasket lines up and matches ports manifold and head so it must have been mismatched before. Bolts were easier to install. Area for the gasket accross the front and rear of the block allmost dissappeared . I ended up using blue oilresistant RTV. Watch the corners where the manifold gaskets and front and rear of blok meet . Notorious leakers.