Has any one used the cometic 3=layer head gaskets with aluminum heads and cast block? Results and opions.

They call for a 50 RA or better. I am using the Cometic .027" gaskets with Stealth heads. I called 440 Source to make sure the finish was ok for them before I assembled the engine, and my block was definitely smoother. Unfortunately, after about 1000 miles they started seeping oil (no coolant though). I called Cometic about it and they recommended retorquing the heads, even though you're not supposed to have to with these gaskets. If I had to do it again, I would use some copper spray on them also. If you do a Google search on the topic, you will find that people have had good luck doing that.