Maybe someone has posted this before, but, I've had a pass side header gasket problem ever since I put my II together. Have Sanderson shorties with alum Pro Action heads and have constantly had failures. Buddy turned me on to these layered aluminum gaskets from Mr. Gasket, ended up buying a set of Percys, but they are the same and I'm really happy. They flat work, best $29 I've spent in a while, very pleased. Bought them from Auto Zone, cheaper than Jegs/Summit.