| Listed in parts books | Not catalogued by year yet |
PISTONS TRI 3T PU 350 8.5
Piston for the Triumph 3T pre-unit 350 twin, listed with an 8.5 compression figure.
R1635 is a piston listed for the Triumph 3T, the pre-unit 350 twin. The catalog entry notes an 8.5 compression figure alongside the model call-out, so this is a compression-specific piston rather than a generic fit-anything part.
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We don't have more detail on this one beyond what's in the listing. If you're rebuilding a 3T top end, give us a call with your bore size and cylinder head compression info before ordering so we can confirm this is the right piston for your engine.
As always with pistons, get the actual measurements off your barrel before you commit — casting numbers and catalog listings are a starting point, not a substitute for checking what's actually on the bench.
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