>From the info I have in my chart, it may be that the head on the GT6,
being 3.550", is possibly a TR6 head and not the original GT6 unit.
My vote is yes, you can mill the head that far to get the numbers you
want, though getting some domed pistons may be the way to go.
Application CR Thickness CC depth CC volume
-------------------------------------------------------------
GT6 Mk I 9.50
GT6+ 9.25 3.450 0.425 34
GT6 Mk III 9.25 3.32 .47 37
(early)
GT6 Mk III 8.0 3.40 .55 44
(late)
TR250, TR6 8.5 3.55 .60 48.5
TR6 middle 7.75 3.54 .68 55
TR6 late 7.5 3.55 .70 57
TR6 race 1 10.25 3.375 .52 41.6
TR6 race 2 12.3 3.295 .44 33
GT6 race 1 10.75 3.31 .385 30
GT6 race 2 12.75 3.22 .300 24.4
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