Dave,
Head thickness is measured from the valve cover flange surface that
encircles the top of the head to the block mating surface. A pair of
calipers works perfectly. A machine shop will be able to check this for
you if you cannot.
Check out this compresion ratio tech article. It also takes into account
cylinder overbore which affects compression.
http://goodparts.com/tech_docs/TR6_Compression_Ratio.html
Early heads are at 8.5:1, later heads (1972-1976) are at 7.75:1.
Greg
CD6250L
----- Original Message -----
From: "TR6 Triumph" <tr6_1969@hotmail.com>
To: <6pack@autox.team.net>
Sent: Wednesday, May 28, 2003 2:26 AM
Subject: Head thickness
> Hello All,
>
> I am wondering what the original dimension is for the thickness of the TR6
> head (and exactly how to measure it), so that I can find out how much, if
> any, the head has already been milled. Is it different for early and late
> TR6 heads? And is there a chart somewhere that lists thicknesses to
> compression ratios?
>
> Same for the block. How do I know if it has been previously
decked/milled?
>
> Thanks,
> Dave Herbert
>
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