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March 9, 2020 at 8:46 am
#197019
My serial number is 55856 I believe and is a South Bend motor.
The advance lever has no printing.
The original manifolds on my motor were smooth but very distorted due to over heating.
I put on a spare set of P40 ribbed manifolds that I had.
My theory is the smooth manifolds were prone to distortion from over heating so they were replaced at some point with the ribbed manifolds that cooled better.
The bushings could be made on a lathe and the spiral grease groove could be cut with a dremel.
I can get more info when I get home from work.