| Also known as | 70-70554, JRC 70-70554 |
| Listed in parts books | Not catalogued by year yet |
EX VALVE OS TRI 63-83 6MM
Oversize exhaust valve for 1963-83 Triumph engines, 6mm oversize spec.
This is an exhaust valve for Triumph engines built between 1963 and 1983, listed here in an oversize form. The description marks it as OS with a 6mm figure, which points to an oversize stem or seat dimension used when a head has been reworked or reseated during a rebuild.
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Exhaust valves take the brunt of combustion heat and hot spent gases every time the engine runs, and they wear at the seat and stem over time. An oversize valve like this one is typically fitted when the valve seats or guides in the head have been machined out past standard tolerance, so it is not a straight swap for a standard valve without checking the head first.
We don't have more detail on this one beyond what's in the description. Have your head measured and matched before ordering to make sure the oversize spec here is the one you actually need.
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