[Hal Copple]

by the way, the lower curve was the first, baseline run, the later curve was when the operator noted the "jig" in the power curve, and put in the lightest "white" secondary vacuum spring, note that this 5 buck modification gave about 40+ hp increase in the mid range!!

All for about 5 minutes and five bucks. What Rice car driver would not just croak to get this much hp increase for so little cost and effort.