Re: AC on GMC 270
If your truck has the original hand throttle you may need to just pull it out a little when running the ac. Other wise, Ray is right the 60's cars with ac had what he described, I changed out the carb and manifold on my original 64 and had to go back and rig one up so it would kick the idle up.
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1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread
1964 Chevelle Malibu w/ 355-350TH (daily driver)
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