oil pump drive shaft is loose


The Grumpy Grease Monkey mechanical engineer.
Staff member
I put in a new Melling m-55 oil pump with amoroso steel collar shaft #22070 in my 350 crate motor. With the distributor installed and fully seated, the shaft can move up and down 1/4 of an inch and this shaft doesn’t snap on to the pump as it does with the plastic sleeve.Is this normal? Thanks in advance

chevy oil pump drive shafts are available in several lengths, because various brands of oil pumps vary considerably in the length required.
you can also install a BBC oil pump on a SBC engine, in some cases, and applications.
there should be about vertical .050- .060 play in the oil pump drive with the distributor clamped in the intake



read the linked threads and sub linked info its well worth the effort to do so
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