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Valve guide composition


Well Known and Active Forum Website User
VOC Member
Hello, can anyone tell me what is the propper bronze composition for Vincent valve guides? Thanks.


Well Known and Active Forum Website User
VOC Member

I have always believed it to be very good because it contains graphite. If I remember correctly, I clearanced valves at .001 to .0015. They do not wear very quickly.

I really followed the pack on this one. Justin MacKay-Smith had a batch made in the 1980's, so it was easy for me to keep using them. I just asked Pat Manning and he said he too had a batch made and used them on his bikes. I was told that the thermal performance and expansion was very good for aluminum heads and they could be clearanced tight enough to avoid using seals. I think seal technology has come a way since then, but the guides always worked well for all of us.

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