[brians]

Originally Posted by Brian Baker

The mounting holes aren't cast-in, so with enough meat in the head, they can be drilled and tapped anywhere you want them...just a matter of changing the program on the machine.

I see what 455-4+1 is talking about. Using it strictly on an aftermarket head is one thing. Bolt it any way you can or want just so it seals.

But using it on a factory head or with the factory bolt locations is another issue. There is no material for the rear bolt. Based on the picture even the middle bolt would not work.