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Tri-power conversion on 1967 Grand Prix-linkage problems

Followers

March 22Mar 22

Just added a 1966 Pontiac tripower to my 1967 Pontiac Grand Prix. Can’t get the mechanical linkage to move enough to fully open the middle two barrel and so the outboard carbs are not fully opening. If I push the middle carb linkage from under the hood I can get the carbs to all fully open and the linkage bell crank that connects to the pedal moves sufficiently. I’ve tried everything possible including replacing the pedal rod with thick wire and a straight rod with rod ends. I haven’t tried bending the OEM pedal rod because not sure how that would create more throw. The whole linkage is all rods and bellcrank unlike some gtos that had a cable setup. Has anyone had any similar experience with a b body and if so how did you resolve.