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Thanks for posting Tiger , some interesting reading there.

Can you explain some more regards piston 5mm above deck & effect on head gasket? , are you saying the piston acts as a shroud of some sort?

Thanks again.






Hello fellow Brit!

To reduce the strain on the cylinder head gasket the pistons intrude by about 5mm into the head, so as to cover the gasket area at top dead centre where pressure and temperature are highest. The gasket is made of a spring steel recessed in a groove in the upper flange of the cylinder. The head is machined accordingly