IIRC you have to use the Magnum bolts into the heads' water jackets. Can't use studs here because of the Manifolds beefier construction and clearance issues. I also recommend using Remflex gaskets. (I "planed" the manifold faces with a file beforehand.) I've always had an exhaust leak in the back that I have yet to address (92/93 Magnum exhaust manifolds with Fel-pro gaskets on a 340 x-head in a '73 Satellite). FWIW the D/S Magnum manifold kisses the PS box on the b-body.
