| Also known as | E11228 |
| Diagram | Fig. 1 — CYLINDER HEAD, BARREL AND CRANKSHAFT · ref 37 |
| Subsystem | engine bottom |
| Listed in parts books | 1970–1971 |
Service size valve guide +·015 in.
Service-size valve guide machined 0.015 in. over standard, for cylinder heads bored oversize to fit.
This is a service-size valve guide, machined 0.015 in. over standard, listed under Triumph part number 71-1228 (also shown in older records as E11228). It shows up in the cylinder head, barrel and crankshaft section of the parts books, which is where you'd expect a valve guide to live since it presses into the head to locate and support the valve stem.
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The +.015 in. designation means this guide is meant for a head that's been bored oversize to clean up a worn or damaged original guide bore. It's not a standard-fit replacement - it's the part you reach for when the head has already been machined to accept it, so check what size your head has been bored to before ordering.
Our catalog record ties this to appearances from 1970-1971, but that's the span it happens to show up in our books, not a guarantee of fitment for any particular machine. If you're not sure your head is the right casting or bore for this guide, call the shop and we'll help sort it out before you order.
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