Nettet29. jul. 2024 · Also as a follow up on vacuum secondary tuning if you use a bigger sized carb say a 750 or holley 770 street avenger on a smaller cubic inch build like a mild 350 with mild flowing heads the secondary side might not ever open all the way as its on engine demand and goes by the incoming air velocity that will make the secondaries … Nettet12. apr. 2009 · I ran a Holley 670 on a FRP Crate 340 HP motor. No troubles and good power. I switched to a Holley 570. It has a bit better low end response and better milage. ~15 mpg normal and high teens on trips. It does run out of breath at the high end compared to the 670 but you probably should be shifting before then any way. Pete

Holley 0-86670RD Ultra Street Avenger Carburetor - eBay

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INSTALLATION, TUNING, AND ADJUSTMENT MANUAL 199R10487-1 - Holley

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