| Also known as | 3T, E9348 |
| Diagram | Fig. 4 — CYLINDER BLOCK AND HEAD, TR6R, TR6C · ref 26 |
| Subsystem | engine top |
| Listed in parts books | 1970 |
ROCKER BOX GASKET,63-70 (70-4549)
Rocker box gasket for the 650 twin cylinder head, catalog number 70-9348, later superseded by 70-9348E.
This is the rocker box gasket for the cylinder head on the 650 twin, part number 70-9348, also shown in older catalogs as 3T or E9348. It sits under the rocker box where it seals against oil leaks at that joint on top of the head. The catalog description ties it to the 63-70 rocker box, so it lines up with the earlier rocker box casting rather than a later revision.
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It shows up in the parts book under the CYLINDER BLOCK AND HEAD figures for the TR6R, TR6C, and T120R, so this is a top-end gasket for the 650 twin family, not a generic all-model part. Later factory records show it superseded by 70-9348E, which is worth knowing if you're trying to match up numbers between an old parts book and a current one.
If you're pulling the rocker box for a valve job or just chasing an oil leak up top, plan on replacing this gasket rather than reusing the old one. Have a look at what condition the mating surfaces are in before you button it back up.
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