Jon, I don't understand the take on Monel. Monel is highly
resistant to corrosion being over 60% nickel, copper and some
iron. It's also difficult to machine because of it's tendency
to work harden. It's specified in especially corrosive
environments such as marine and chemical industries.
Your suggestion that the Viton is a better choice for a
carburetor needle is backed up by the rest of the automotive
industry. I think the idea that a metal to metal seal is better
stems from the fact that they are recommended for use in
'High Performance' applications where exotic oxygen rich fuels
are being used so some may think that would be more durable when
applied to their Rochester 'B'.
Viton tips on needles have been around ever since I can
remember. They were in the premium rebuilding kits back when
I was an automotive parts men in the late 50's and on. I would
urge anyone new to rebuilding carburetors to heed your advice
about staking the seat to break the sharp edge since Viton is
principally a rubber.
Denny Graham
Sandwich, IL
