why are black onxy junk?
They're not the correct thickness. They are too thin before they're even compressed, worse when they are.
why are black onxy junk?
Dont go with liberator, you can just deal directly with the shop they use, UCF machine in Carlsile Pa, they are great to deal with and can fix cracked heads to an extent
Did you check to see how flat it was before bolting it on?