Have you ever compared the quality of Auto Zone and Advance vs NAPA? I ruined a headgasket one Saturday night setting the head down on my 97 360 so I got the one available from advanced t5he next day (Sunday)...JUNK! Same company (fel Pro) same number but half the thickness so I waited for Napa to open up on Monday. I could not believe the difference. SO check NAPA. I need to get a Valve cover gasket for my /6 in my 69 d200. I love me old truck. Oops maybe I hijacked the thread...uh was responding to the head gasket comment I guess.