| Also known as | E4791 |
| Diagram | Fig. 5 — CYLINDER BLOCK AND HEAD, T120 · ref 14 |
| Subsystem | engine top |
| Listed in parts books | 1964–1965, 1967–1968 |
CARB BALANCE STUB 5/16-26TPI
Threaded balance stub (5/16-26 TPI) that connects the two inlet manifolds on a dual-carb Triumph cylinder head.
This is the balance stub that connects the two inlet manifolds on a twin-carb cylinder head, letting the carburetors breathe off a common pipe between them so both cylinders pull evenly. It's a small threaded fitting, cataloged with a 5/16-26 TPI thread, and it lives right in the middle of the cylinder head area between the two carbs.
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In the parts books it also shows up as E4791, the older letter-prefix form of the same number. It's a one-year listing in our records, tied to the cylinder block and head section, so it's a narrow-fitment piece rather than something that carried across a long production run.
If you're rebuilding a dual-carb head and the balance pipe setup is missing or stripped, this is the stub that seats into the manifold. Worth checking your existing threads before ordering to make sure the fit matches what your head takes.
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