Quote:
Originally Posted by Geerhead55
Thanks Bob,,, love that underhood shot of the Thunderbolt. I never realized they ran vacuum secondary carbs and backwards at that! As always, an education is just around the corner. Take care.
Danny Durham
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Danny, I don't believe four barrel Holleys were anything but vacuum secondaries in 1964.
In fact , all factory Holley engine combos were vacuum, AFAIK
Good luck trying to find the exact year of the first DP carbs on the 'net though ..I give up!