Headgaskets Aluminum Heads

jos51700 said
I like the Cometic/MLS because as the head expands at a different rate than the block, the leaves of the MLS are free to expand at different rates against one another so they minimize stress in the gasket itself. A composite gasket might just tear apart internally.

Full disclosure, I've not used any of the other gaskets in this thread. I've done a dozen Neon heads and a billion all-aluminum motors (motorcycle).

Some of those bikes take special care when torquing them say cometic.
Volvo's, done many. Iron block w/aluminum head. They end up near 90 lbs but it's the 2 step then 90 degrees more 'torque angle' deal. No issues, or her than porosity in the rear passage 'we weld those up and flatten the head'.
Theres really no issue with by metal motors that imo wasn't flat out a design flaw in the core.