Was easy to do. Was planning on waiting till the engine was in the car. Then decided when cleaning up the pump i would just do it today. Didn't use a new seal mine should be fine, if it leaks then ill get the new seal kit.
I removed the smaller spring and put a 1/16" thick washer in it's place.
the governor still works and the power through the midrange and upper end increased.
I can't wait to do this mod! IT IS GETTING CLOSE TO THAT TIME
I think I will shim about.. as much as I can. or maybe be conservative?
Has anyone tried small shim and then went more shim? was there any increase in power? butt dyno readouts? increase in smoke? EGT's?
I usually replace the main spring with a solid piece of tubing and leave the intermediate alone.
Runs great, no de-fueling at all..
I've built a pump or two just for reference..