839901 block casting code might be 1929-30 194 ci block
If that is correct, the J 9 9 would be a November 9 1929 code?
The last 1929 engine was #1,265,800 in October 1929.
Dave's number is T 91,426 (T = Truck). With about 33,000 engines cast every week that puts his engine in the 3rd week of 1930 production which would be early November.
His manifold casting number is also correct for 1930/31.
I'm convinced he has a very early 1930 model year truck.
Mike B
