| Diagram | Fig. 5 — CYLINDER BLOCK AND HEAD TR7RV · ref 23 |
| Subsystem | engine top |
| Listed in parts books | 1974, 1976–1980, 1985 |
Stud - cylinder head (3/8 in.)
3/8 inch cylinder head to block stud for the Triumph 750 unit twin engine, part number 21-2201.
Part number 21-2201 is a 3/8 inch cylinder head stud, one of the fasteners that clamps the head down to the cylinder block. These show up across the CYLINDER BLOCK AND HEAD figures for the T140V, T140E, and TR7RV, so this is the stud used on the 750 unit twin engine family.
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A stud like this threads into the block and takes a nut over the head, and it's a part that takes real clamping load holding the combustion seal together, so it's worth checking the condition of your existing ones for stretch or damaged threads before you button the top end back up.
Our catalog record shows this stud appearing in nine separate listings spanning 1974 through 1985, so it's a long-running part in the 750 lineup. If you're working from an older parts book with a different number, bring it in or call and we'll square it against the current listing.
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