FSB 178, April 1951 said that compression relief cocks were no longer being supllied on A,B,G tractors as they not of general use, and as an effort to conserve copper (Korean War), but they could be ordered as replacement parts if required, so pipe plugs were installed into the machined ports. I THINK that early "B"s did not have them added into the block until l ater, but there is mention of an improved design being introduced in '39. A different angle attempted to blow the fuel and oil away from the tractor.
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