| Also known as | E3880 |
| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE; INLET MANIFOLD · ref 7 |
| Subsystem | engine top |
| Listed in parts books | 1964–1969 |
Stud (14 in. OA)
A 14 in. overall stud used at the inlet manifold and oil pump areas on Triumph unit twins, also listed as E3880.
70-3880 is a stud, 14 inches overall, that shows up in the inlet manifold and oil pump areas of the engine on Triumph unit twins. The catalog record ties it to both the oil pump and release valve assembly and to the inlet manifold fittings, including listings that call out the single-carburetter T90, T100S and T100C and the twin-carb T100T and T100R. The legacy number for this one is E3880, so if your parts book still uses the old letter-prefix system that's the same stud under a different label.
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A stud like this holds a manifold or carb mounting flange in place, giving you a fixed threaded post to torque a nut down onto rather than relying on a bolt head. Since it turns up across multiple figures spanning oil pump and inlet manifold work, it's worth checking which assembly you're actually working on before ordering, since the same part number covers more than one job on the engine.
We don't have more detail on this one beyond what's in the catalog listing. If you're not sure whether it's the stud you need for your particular oil pump or manifold setup, call the shop and we'll confirm before you order.
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