| Also known as | E3208 |
| Diagram | Fig. 3 — CYLINDER BARREL AND HEAD · ref 6 |
| Subsystem | engine top |
| Listed in parts books | 1963–1966 |
Valve guide
Valve guide for the cylinder head on 350/500cc Triumph unit twins, also listed as E3208.
70-3208 is a valve guide for the cylinder head, showing up in the parts books under CYLINDER BARREL AND HEAD listings and specifically in the 3TA, T90, T100, and T100SS cylinder block and head figures. It's also known by the alias E3208, which you'll see on older parts lists. A valve guide is the fixed bore in the head that the valve stem rides in and seals against as it opens and closes, keeping the valve tracking straight and carrying heat away from the stem.
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Our catalog record ties this part to the 350/500cc unit-twin cylinder head family across appearances from 1963 to 1966, so it's the right guide to be looking at for those engines, but we'd confirm against your actual head before ordering since guides can differ between intake and exhaust positions and between engine variants.
If you're pulling a head apart for a valve job, guides are usually replaced as a set along with new valves and seals rather than on their own - worth checking the wear on both guides while you've got things open.
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