This past winter I took my fabbed aluminum covers and trued them all up to within about .003" of being perfect. Thought for sure that would stop my leaks - nope! Measured the Indy head edges and they are pretty true. I just give up! I've tried every gasket known to man, sealed one side with Rv, sealed both sides with Rv - nothing stops it. I have come to the conclusion that with the large puddle of oil that stays on the bottom of these Indy heads, keeping the bottom edge submerged all the time, they are just going to leak - seep if nothing else. The heads need some return holes in the bottom, somehow. Last gaskets I put on were plain cork. With the flat bottom fabbed covers I can see the gasket all around. Totally saturated cork all along the bottom while the top side is dry as a popcorn fart.
