[Fot] difference early and late TR6 Cylinder head

[Enquiries Road & Track]

i know 100% all the TR6 PI/2500TC heads used the same inlet manifold
layout/gasket, which is totally different spacing to the TR250 heads. As
i'm not USA based, i have no confidence in any claims about how long
Triumph continued the TR250 head set-up for, but my recollections from the
days when they were new, was it was not very long. maybe as some suggest,
the first few TR6's that went to USA, used this also

Terry