Black Diamond valves larger diameter than stock?

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Douglass Harroun

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I've seen reference to Black Diamond Triumph valves being .060" larger diameter than stock-- is this true for Norton?
Thanks
Doug
 
Douglass Harroun said:
I've seen reference to Black Diamond Triumph valves being .060" larger diameter than stock-- is this true for Norton?
Thanks
Doug
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Black Diamond valves are available for a Norton in standard or .060 oversize.
.060 oversize valves will cause valve clash except with certain cams. Jim
 
Jim, are these the 1.5 mm oversize valves you use in your head mod? How do you deal with potential valve clash with your head mod?

Ed
 
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