Kevin Here is some information from an old SUN distributor tester chart, 1954 Chevrolet, ALL, Dist.#1112396, cent. adv. spring tension 19-23oz, dist. rotation RH, dwell 38-42, pt. gap .016, cent adv.0-2 deg.@375rpm, 7- 8.5@1000Rpm, 12-14@1750rpm, vac adv. 4"-6... Login to read more.