So I should of done a little more research before port matching my heads. Now I need a gasket for the aftermarket manifolds to match. The OEM gasket opening are too small for the porting/manifolds . Anybody know out there where i can get a gasket that matches the port matched heads/manifolds? I tried opening up the OEM exhaust manifold gasket by cutting, dremel, and punch die type of tool but I wasn't satisfied with it and concerned it might fail with time due to the non clean cutting i did. Any recommendations?