| Listed in parts books | Not catalogued by year yet |
PISTONS TRI 3T 350 PU 8.5
Piston for the Triumph 3T 350 pre-unit twin, listed at 8.5 compression, PN R1635/030.
This is a piston for the Triumph 3T 350, a pre-unit small twin from Triumph's older engine lineup. The catalog entry lists it at an 8.5 compression figure and part number R1635/030 in our records.
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We don't have much more detail on this one beyond what's in the catalog line itself. If you're rebuilding a 3T motor and need to confirm bore size, ring pack, or oversize designation against your engine's actual measurements, give the shop a call before you order.
Piston work on these older pre-unit engines is worth getting right the first time — mismatched bore or compression can mean a return trip to the machine shop, so we'd rather confirm fitment with you up front than guess.
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