yes your 87mm pistons is the larger displacement (2038cc).
I have the model 40795, 1967 TR4 distributor on my 1960 TR3. Originally, it
had 83mm pistons, yielding 1968?cc, but I was told by experts that the
standard improvement was to boost it to 87mm. But that doing so required a
TR4 distributor.
Knowing little, I imformed my 'well-respected machine shop'. Being
grown-up bikers, they bored my jugs to the new dimensions. I've yet to drive
a Triumph- I am working on the wiring at the present.
Thanks, Paul Dorsey
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