On Wed, 1 Dec 2010, Bob Bownes -Seiri wrote:
> Yes. The port spacing is different. I don't recall where the cutoff was
> though.
For federal emmisions spec TR6, the TR250 and TR6 CC25000 through roughly
CC75000 all had the "narrow port" heads and the intake manifold that tries
to force air to turn at right angles.
:-)
But figure that the US got the good heads starting with the '72 model
year.
There's actually a lot of minor nuances through the model years with the
'72 getting the best of all the various parts.
regards,
rml
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