| Diagram | Fig. 4 — MANIFOLD AND TAPPETS · ref 1 |
| Subsystem | engine top |
| Listed in parts books | 1974, 1976–1978, 1980 |
Inlet manifold
Cast alloy inlet manifold, PN 71-3556, for single-carb Triumph TR6/TR7 twins.
This is a cast alloy inlet manifold, part number 71-3556, the piece that connects the carburetor to the cylinder head on single-carb Triumph twins. It sits at the top of the engine, in the same area as the tappets, which is why you'll find it listed alongside the tappets in the manifold and tappets section of the parts book.
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Our catalog records show this manifold appearing across rows dated 1974 to 1980, and other listings we've come across tie it to TR6 and TR7 model figures specifically. If you're working on a single-carb 650 or 750 twin from that era, this is worth checking against your original casting before you order, since manifolds changed over the years and stud spacing or bore size can catch you out.
It's a straightforward piece mechanically: no moving parts, just a passage that has to seal properly at both ends. Give the mating faces a look before you bolt it up, and make sure your stud pattern matches what's currently on the head.
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