Cometic Head gaskets
I have always used Fel Pro 1099, head gaskets. On my new engine I switched to Cometic MLS because I was using a new A460 block and it was going to be decked and I thought this was the time to change to the MLS gaskets because they are re-usable. The block and heads were finished to Cometic specs and within 2-3 minutes of the initial start-up both sides of the block started leaking water on the exhaust side between the head and the block. After cool down I checked the radiator pressure, leaked the engine down and there appeared to be no leaks. I took the heads off and the sealing marks on the block and heads appear to have no areas of leakage and the gaskets looked new. I put on a new set of Felpro 1099 gaskets and everything is great now with no leaks. These are 10 bolt A-460 heads and an A-460 block. Any one have any comments on this problem with Cometic gaskets???