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CB350K2 Valve Stem Seals

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Craizeehair:
Thanks Ted, I wasn’t sure if it was a must or must not do type of thing. That puts my mind at rest.

Bryanj:
Its been many years since i worked on a K3/4 but i dont remember any seals, those seals shown by another member have a 333 middle number which is 350/400 four not twin.
Tha top of the guide needs to have a groove to retain the seal if yours are just angled i would check the valve to guide clearance and if ok leave them off

McCabe-Thiele (Ted):

--- Quote from: Craizeehair on July 04, 2026, 01:50:42 PM ---Thanks Ted, I wasn’t sure if it was a must or must not do type of thing. That puts my mind at rest.

--- End quote ---

The early basic BMC A series engines had no valve stem seals.
Later tuned versions of the engine, Cooper S, MG etc had valve stem seals.
As well as the cost of fitting valve stem seals early versions soon went hard, improvement in seal materials helped.

As Bryan had said the outer part of the stem seals is designed to fit in a groove on the valve guide, do your guides have a retaining groove?

Craizeehair:
Thanks for the info. I’ll have to check for grooves when I get back in the shed

Craizeehair:
There’s no groove and the valve to guide clearance is good. I will remove these existing seals and refit without them.

Thanks for your help.

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