| Listed in parts books | Not catalogued by year yet |
VALVE GUIDE,BSA A10+.004
An .004-oversize valve guide for the BSA A10 engine, used when rebuilding a cylinder head with a worn guide bore.
This is a valve guide for the BSA A10, machined .004 over standard size for a rebuild where the original guide bore has worn oversize. It's not a Triumph part, and it's not something we'd install in a unit or pre-unit Triumph engine — the description on this one is specific to the BSA A10 twin.
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A valve guide seats in the cylinder head and gives the valve stem a true, controlled path to move up and down as it opens and closes. Oversize guides like this .004 version come into play when a head has been reamed out to clean up wear or damage, letting the shop fit a guide with a slightly larger outside dimension to restore a proper interference fit in the head.
We don't have much more detail on this one beyond what's on the part number itself, so if you're working up a BSA A10 head rebuild give us a call and we'll confirm it's the right guide for your application before you order.
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