Centering copper sealing gaskets on liner sealing surface

[virusdoc]

I'm installing CBP copper sealing gaskets on my 90.5 liners. Because CBP makes the same gasket for 90.5 and 92 mm P/C's, they are a bit large for the 90.5 liners. They also have about 1 mm slop inside the heads (Mofoco 041's), so I can't rely on the heads to center them correctly. Any tricks for ensuring they are centered on the sealing surface of the liner, rather than off center (which would decrease the surface area of the seal)?

I am aware that there are strongly polarized opinions on whether these are desirable, or a stupid waste of cash. This request is for those who also use them and might be able to assist with my question.

FWIW, I called CBP and they told me that their cylinder heads are cut to a precise 92 mm tolerance and perfectly center the ring, but since I wasn't using their heads they couldn't recommend a solution. This answer didn't make much sense because even if they are correct on the tolerance of the head being better than Mofoco's (doubtful), there is nothing to prevent the entire head from shifting up/down/left/right slightly when installed on a 90.5 liner.

Thanks for your advice.
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[Ohio Tom]

Sounds like the head is bored too large to me.
Maybe Roy can speak to that?

Maybe they are cut for 94's?

The copper head gasket should fit closely into the head. If it has 1mm of slop, that is an issue.

I have used CBP heads for over 20yrs now. The bores are always right on size and have no issues with copper head gaskets fitting.

[virusdoc]

[txoval]

I agree with Tom, I have used copperhead gaskets for 90.5 bore engines with heads from CBP. The copper gasket fits perfectly into the head, no slop. It is actually a pain to remove them.

If there is slop, I wouldn’t use them

[jpaull]

Maybe the cylinder head is stamped 92 with the intention for 92 thickwall that uses 94 size od
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[modok]

OK sure that's a nice way of saying the head is bored too big.
Lose the gaskets or get heads that fit them

[virusdoc]