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CB750 Head Gasket copper or not ?

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Trigger:
CB750 head gaskets have always been a problem on the early engines and i have always got round this with upgraded 0'rings.
Today i was asked a question by a old time engineer that set me thinking. Why has no one ever done a copper head gasket for a CB750 ?
The most important part of any head gasket is the fire ring. The next is the sealing of any oil ways so, does anyone have any views on why a copper head gasket with insert 0'rings would or would not work ? 

robvangulik:
I made a copper gasket in the eighties, after upgrading to 836cc. and putting in a sports cam and Kawa carbs.
The main idea was the re-useability, as the wiseco gaskets were quite expensive.

UK Pete:
I have seen them for sale at cycle x

Sent from my SM-G930F using Tapatalk

K2-K6:
I thought that you'd asked about them before Pete, I was trying to search about what came up.

They do go quite soft when annealed but they are routinely pulling drag race motors apart generally,  be interesting to see if they do any other prep to use different gasket material.

Trigger:
Cycle X have had them down as out of stock for years on there site and only did them in 65mm and 67mm, nothing std in copper. They do the MLS head gasket but you would have to skim both surfaces to require a much finer RA finish.

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