I recon it would fit nicely on my uncles 1930's kero tractor. The standard pipe on it came from the laundry drain under the old cement wash tub. With it's 8 or 9"bore, 10"stroke, this pipe looks like it would give it plenty of mid range (at about 600rpm on this old girl). Might even get 6 mph out of the old girl too! or maybe I'm dreaming...................
Bit worried about the jetting though!
Peter B