07-24-2012, 06:27 PM
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CC Member
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Join Date: Oct 2008
Location: Spanaway,
WA
Cobra Make, Engine: FFR MK3.1 / 347 Stroker 425 HP
Posts: 408
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Not Ranked
I bought the carb from Summit Racing. I contacted Holley. They told me the 63 primary and 73 secondary jets is stock for the Ultra Street Avenger 670cfm. No sure why they do that. Although, my engine is running great with the 68 primary.
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