I believe 1963 was the starting point for crankcase controls in CA, the
federal requirements followed a few years later. But many makers, including
Triumph, elected to deliver all US cars as CA-spec. There were several
reasons, but probably the biggest one was that they didn't know where the
cars would be finally delivered when they were first shipped.
There was definitely a US-only smog package by the TR4A, but I'm not certain
about the TR4. And of course, US emissions were the reason the TR250 was
created, a US-only model.
Randall
>
> I'm not sure about the TR series, but the Herald, Spitfire,
> et.al. change point was earlier in the US than for the home
> market. ISTR that there was some US requirement for a positive
> crankcase ventilation system of some sort beginning around the
> 1963 model year (possibly even earlier in California? CA listers
> can verify/deny?). And that 1963 date can be borne out by various
> Heralds and Spitfires I've dealt with over the years.
>
> --Andy Mace
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