Cast Iron Front Mount Distributors????

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Posted by Farmer Dan on October 21, 2018 at 17:52:25 [URL] [DELETE] :

I know the 9N12131 base with a circle 2 casting mark do not have the vents in them. The circle 3 bases do have two vents in them. Some have the part number cast into the some don't. So what is the the circle around a number trying to tell us? Is that a casting code or a revision? And how do I determine if they were ever made in cast steel and when did aluminum start? Would a blueprint of part number 9N12131 tell me what the base was made of?


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