| Also known as | E9973 |
| Diagram | Fig. 3 — OIL PUMP, RELEASE VALVE, MANIFOLD AND TAPPETS · ref 22 |
| Subsystem | engine bottom |
| Listed in parts books | 1970–1971 |
Inlet manifold
An inlet manifold (Triumph part 70-9973, also listed as E9973) carrying fuel/air mixture from carb to cylinder head.
70-9973 is an inlet manifold from Triumph's own parts records, showing up in the catalog under the figure that covers the oil pump, release valve, and tappets. It also carries the older E9973 number, which is the same physical part listed under the earlier letter-prefix system used in Triumph's parts books.
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An inlet manifold's job is straightforward: it's the passage that carries the fuel/air mixture from the carburetor into the cylinder head, so it has to seal properly at both ends to keep the engine drawing clean mixture instead of false air. Because it's grouped in the catalog with oil pump and tappet parts rather than a dedicated carburetion figure, it's worth checking the gasket and mounting hardware at the same time you're in that area.
Our catalog record ties this one to appearances from 1970 to 1971 but doesn't spell out a specific model. If you're matching this up to a head or carb setup, give us a call and we'll confirm fitment before you order.
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