Bob Joehnck "Compelator" for drag racing
Late '60s vintage item as seen in the "How to Hot Rod Small-Blocks Chevys" book. A circular slide rule for the racer who wants to figure top speed, engine rpm, gear ratios and tire diameter for optimum performance. SOLD
Last edited by 1967Z28; 05-29-2017 at 10:27 PM.
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