Well thanks to a couple of fellows in the big bolt section that have answered 2 of my questions and one I did not ask they now have given me the need to ask a couple more here in this site the help here is great anyway to the questions. It seems I am the proud owner of a 1953 3 ton truck with a 248 engine. The odometer reads 18000 miles truck has not been used since the mid 70s. Now my questions 1 can it be run on unleaded fuel without the use of lead substitute or will it need to be rebuilt with the hardened valve rods. 2 will it maintain 50-55 miles per hour speed limit as if I dont have to change the drive train I would like to keep it as close to original as possible and I plan on driveing it daily. I believe that trucks of this period have class and deserve to keep working heck its only a year older than I am and I still work. Thanks for your help.