I just got a 1951 1/2 ton and I can't make any sense out of the numbers on the block. These are just behind the distributer 30 6D161488. The #s on the head are 3835913.
What You've Got : ..Is called ' Old Truckitis ' and it's not cureable I am glad to say.... Your presciption : leanr to adjust valves dwell and timing and you'll be a very happy man afore you know it.....