| Also known as | E3739 |
| Diagram | Fig. 5 — CYLINDER BLOCK AND HEAD, T90 · ref 14 |
| Subsystem | engine top |
| Listed in parts books | 1964–1969 |
EXHAUST VALVE 350 TWIN
Exhaust valve for the Triumph 350 unit twin (3TA/T90), also listed as E3739.
This is the exhaust valve for the 350 unit twin, the 3TA and T90 engines, as shown in the cylinder block and head sections of the parts books. Also known by its legacy number E3739, it's the part that opens to let spent gas out of the combustion chamber on the exhaust stroke, then seats back down to keep compression where it belongs.
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Catalog appearances for this valve run from the mid-60s into 1969, matching the run of the 3TA and T90 350cc twins. If you're doing head work on one of these engines, this is the exhaust-side valve to check against your part number before ordering — intake and exhaust are not the same part.
Call the shop if you're not sure whether your engine takes this one or one of the other valve numbers in the same family. We'd rather confirm before it's on the counter than after.
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