In Reply to: Early 9N features posted by Paladin (Bob In PA) on September 06, 2008 at 17:57:15:
Early style exhaust manifold with the cast boss in the back on the carb attachment neck, and a plugged off threaded hole in the boss (as if to attach a vacuum tube of some sort).
Both 39 9N's have it, as does the earliest '40 9N (13833). The later '40 9N has a boss on the FRONT of the neck, the neck appears slightly shorter, and the boss is not drilled.
I have NO tractors (as far as I can tell) that were ever drilled for a vacuum port in the air pipe to the carb.
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