On Thu, 8 Nov 2007, Tony Gordon wrote:
> Terry
>
> I believe the numbers refer to a late head with the smaller exhaust valve
> (1.19") and the swept throat. Not sure on the circle B front, but checking
> the casting numbers should verify the head as a later head. I do already
> have two early heads (72 and 73) but I cannot work the intake and exhaust as
> I would like with the early heads.
72 and 73 heads are "late" style, aka PI (with the wide port spacing).
Early is TR250, TR6 with CC numbers less than CC50000, more or less)
Just wanted to make sure we're talking about the same thing.
regards,
rml
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