help with copper headgaskets

I have a B1MC 588 World alum engine and I am trying to source a copper head gasket .021 for 4.53 bore with the oring in the head measuring 4.80 on the outside diameter. I tried SCE website but can only find a 4.52 bore gasket. any ideas?
This is a nitrous motor?

Mike

no ideas?

I would call clark they should be able to make them for you.

.021 thickness? How far down is that piston? Steel rod needs around .039 piston to head and aluminum rod around .020 more.

Call SCE direct, they have made more than one custom Hemi head gasket for me, give them all the info you can They specialise in race gaskets of all types

The pistons is .010 in the hole. How far should the ID of the oring be to the gasket bore? The wire is protuding .010 out of the head.