I used the composite gasket last year on my 261 after using copper gaskets for 45 years. I had the same concerns as you. In the end, perfect. I have not even bothered to retorque the head. And my motor uses high compression forged pop up pistons. Still no issue and the motor has at least 40 runs down the drag strip over the last two years.
Last edited by Dragsix; 09/01/2022 8:59 PM.
