The 660 carbs I have worked on have not had the throttle linkage progressive. The secondary throttle blades open equally with the primarys,which works good for drag racing, but won't work as good on the street. You could try the 450 cfm carbs, but on something like your building, I would like mechanical secondary carbs. Don't they make a 390 cfm carb?
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05-11-2008, 02:26 PM #21Junior Member
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- Feb 2006