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I've heard of ppl swapping out the 583 rotary valve for a 670 and they have had great sucess. I have also heard of a ppl swapping the 583 jugs for 670 jugs but I never heard of the out come.
 

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Originally posted by bcsledhead
[br]501 rotary valve is known as the nasty where we live. thanx
I have a 501 rotary in my 93" Mach 1 670. They came stock on the 93",and were holdovers from the 92" X model w/ twin pipes and 44mm carbs.
The 501 is a 169 degree duration valve. Kick ass.[:D]
 
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