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I'm using BG Speed Demon 650DP. After playing with the Holley this way, and that, I gave up. BG's just seem to work better with hotter cams.
Smaller engine, heavier car, auto trans, mild cam: use vac sec carb. Secondaries don't open until engine demand needs extra fuel.
Larger engine, lighter car, manual trans, hot cam: use DP carb. Secondaries open when you put your foot in it.
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