ArdWrknTrk Posted May 5, 2022 Share Posted May 5, 2022 Jim, I should have replied to this one earlier, Holley introduced the double pumper mechanical secondary carbs around 1969 or 1970, we sold a load of them. I just didn't know if that particular 650cfm double pumper was available before Holley started putting in the check valves. At any rate, I still don't have much information to try and figure out why this truck is pig rich and lighting up through the exhaust. Do you have an angle that might explain his problem? Link to comment Share on other sites More sharing options...
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