Norton 500cc with 650cc intake valves

Joined
Jun 3, 2011
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Hi All,

I have a friend who is running stock Dommi Model 7 iron head with stock exhaust valves with 650ss intakes. Do you know what the installed height of the valve springs is, or valve stem protrusion. Can not seem to find this info on the web, or in my books.

Thanks,
Skip

P.S. also , thanks you all for the offers on a crankshaft, looks like one is on its way !!!!!!!!!!!!!
 
As nobody seems to know, the really important bit is to prevent the valve springs getting coil bound on full valve lift by the camshaft.
For a normal street engine I would aim for a minimum of 100 thou before coil bound. If it is more than this don’t worry. On a race engine you might be less but then you really need to be checking a lot more things as well.
HTH
 
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