chetman-

If there is a way to adjust the pump stroke/height, it would be to bend the arm that connects it to the throttle linkage. I've never heard of anyone here doing it, and that makes me hesitant. It is shown as part # 36 here:

http://chevy.oldcarmanualproject.com/carb/Rochester/9C305p01.htm

Your suggestion of the slack in the linkage system is a good thought, but the problem will occur even when I manipulate the throttle linkage on the carb.

Bryan
1954 3104 235 "AD" L-6 3-on-the tree