The cylinder head height for a typical US spec TR6 is 3.535 inches. A head
which is stamped 218227 inside the valve cover between cyls 1 & 2 or is it 3
& 4 will have that number. To machine that head so it has a TR6 injection CR
of 9.5:1 requires the height to be reduced from 3.535 to 3.400 inches. The
reference points for the dimension are obviously devoid of valve cover and
cylinder head gaskets.
Jonmac
"In the Shadow of my Father" aka "Life at Triumph"
http://www.toolbox.ndirect.co.uk/triumphbook
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