| Also known as | 70 9511, E9511 |
| Diagram | Fig. 6 — CYLINDER BLOCK AND HEAD · ref 25 |
| Subsystem | engine top |
| Listed in parts books | 1969–1970, 1974 |
ROCKER BOX GASKET 500/350
Rocker box gasket for Triumph 500/350 unit twins, seals the rocker box to the cylinder head.
This is the rocker box gasket for the 500 and 350 unit twins, the seal that sits between the cylinder head and the rocker box that covers the valve gear on top. It shows up in the catalog under the CYLINDER BLOCK AND HEAD figures for the T90, T100S, T100C, and T100R, so it's a gasket you'll be pulling out any time the rocker box comes off for a valve inspection or a top-end refresh.
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The part number 70-9511 also goes by E9511 in the older letter-prefix numbering, same physical gasket. Factory records show this part was later superseded by 70-9511E, so if your parts book or an older gasket set lists the E suffix, that's the same seal under a newer number.
When you're ordering, keep in mind this gasket is specific to the 500/350 rocker box arrangement, not the 650 or 750 twins, so match it against the head you're actually working on.
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