1962 Dorman 3LB Dorman 3LB - Year of Manufacture approx 1962 Dorman 3LB. 47hp @ 1500rpm. This engine will completed with custom gearbox adapter, PRM 260 2:1 ratio gearbox, and finished with 24v electric start and alternator. £7450 (Major Overhaul & New Gearbox)