I assume you're talking about intake port spacing.
According to Dr Dave, the literature says CC75000.Sometime in late '71 or
early '72.
Best way is to measure the distance between ports. Early: 1/2" Late: 1"
Hope this helps.
Bill
----- Original Message -----
From: "robert bownes" <bownes@seiri.com>
To: "FOT" <fot@autox.team.net>
Sent: Monday, July 18, 2011 10:23 AM
Subject: [Fot] TR6 head cutover
> Anyone remember when the TR6 engine changed port sizes? Year or S/N?
>
> Thanks,
> Bob
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