Hi,
I'm going to toss in a tuppence here.
The TRF book lists a different adjustment screw for PI (and late TR6), but
the rockers are listed as the same for all TR6 (allowing that there's are
odd and even rockers, of course).
As far as the ratio, all stock setups are between 1.42:1 and about 1.46:1.
The mention of 1.5:1 is very optimistinc.
You can prove it yourself - measure the amount of cam lift and then
measure the amount of valve lift on a couple of valves. You'll be amazed
at the differences. Especially on a worn motor (with stock rockers).
This is one place where roller rockers "win". The ratio should never
change over the life of the part.
Regards,
rml
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Bob Lang NER/SCCA | This space for rent
Solo Chair 2008 TR6 40 F Prepared | Triumph!
Voice:781-438-2568 FAX: 617-258-9535 | Cell: 339-927-4489
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