They do, a 4 layer MLS (its Blue) I used them in my motor build. I am not convinced gasket type is the problem tho....... Another guy on another forum down in Florida lifted his too this weekend.
I know one thing, they sucessfully have me scared $H*%less.
I can get some Air Force ratchet straps to run around yalls motors. Just tighten the piss out of it so the heads cant go anywhere.