1941 JD B cam grind and piston to cylinder clearance

looking for factory cam grind specs for my B and late model b. also open to performance grind suggestions. I also am looking for the proper or tightest piston to cylinder clearance for my B with 4 11/16 +.045 M&W pistons.
 
Matt, I assume you are building a puller. If so the best cam I have found is the stock 520 or 530 cam. AS far as clearance set her up stock, do not go any tighter.
 

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