My two year old FelPro one piece big block pan gasket suddenly began leaking from the front "U". On a 500 mile trip it leaked two QUARTS of oil that ended up coating the entire underside of my '71. Rather than buying another FelPro gasket I bought a Moroso gasket with the hope it'll do a better (longer) job of sealing. Before I install it I'll lay it onto my pan and see how much the front "U" sticks up above the pan. I might have to solder a strip of .032" sheet metal on the front "U" to apply more pressure against the gasket.