[Dick Boneske]

Here is a '65 and '66 setup with the accelerator pump rods configured for "normal" altitudes above sea level. In higher altitudes, the top of the pump rod should be in the hole further away from the pump lever shaft.

I see so many Tri-Powers at car shows with the incorrect setting. The configuration shown in the pictures gives a stronger shot of gas for the end carbs when opening the throttle. Engineers determined that, at higher altitudes, a lesser shot of gas was needed.