I personally have seen Vance ride, and that bike up close, and worked on the suspension.
there used to be a saying about the late, great Cal Rayborn, that "He rode that Harley faster than it would go". Same applies for Vance and the way HE rode his bike.
The absolute best road race Harley I ever saw was an air cooled one, NOT the KR's, called "Lucifer's Hammer".
My friend and former Harley factory road race mechanic, Craig Fillmer, whom now lives in Mason, Nevada, about 10 miles from me, always discuss different things about both the KR racers and Lucifer's Hammer when we run into each other around town. We both agreed that the biggest problem with the KR's was two-fold, the cams were too small, and the intake tract too long, and that Steve Schiebe, a former Roush Mustang parts washer and Harley race team manager, was not good for anything. All Scheibe wanted to do was copy a Roush 5.0 Mustang engine that had two cylinders cut off it, so those two cylinders would fit in the HD chassis. I met Craig at Daytona the first year they ran the KR's, they were pitted right next door to us. Miguel DuHamel, and, the late Fritz Kling were riding for them then.
I came onto the pit wall in one test session that Daytona, and sat next to Craig, and said "You guys are out of camshaft, specifically, the exhaust cam". He asked me how I KNEW that, I said "Can't you hear it in the engine, listen". We've been friends, and pals in engine design ever since. By Elkhart Lake that same year, with new 'Fillmer'-Maga-Cycle Cams in place, Miguel and Fritz in a very tight pack of 4, leading the race, and pulling away from everybody else, and Miguel almost won the race.
Vance's bike was leaps and bounds past every other HD for its time, great work.
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