Pro-form doesnt make a vacuum secondary 670 cfm body, only a 750 cfm body. Does dropping a 750 mainbody on a 670 avenger base turn the 670 into a 750? I dont think I'm running enough cubes to run well with a 750. I assume the 650 mechanical body they have lacks the vacuum port to operate the vacuum diaphram secondary. Anybody else make aftermarket holley bodies?
I think their 25-50 hp boast is a bit steep! But if it makes 10, thats $100 well spent
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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