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We just replaced the bronze bushing that goes into the engine block (small block Mopar) for the distributor, what size does it need to be reamed out to? The distributor shaft is .490 in diameter, I'm assuming a 1/2" would be fine? What do you think? Thanks

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Hi,
You want it tighter than .010" I just checked mine here that has been run and I have maybe .003"
I'd be looking for .015-.003 on the side cleance.

I pressed the gear off this oil pump shaft and have used it when I drove a new bushing in. Stick the shaft in the new bushing and drive it in with a deep socket and extension. Then use a old screw driver chucked in a drill and spin it up. I do use a washer under it, just didn't have one handy for the picture.

So I would advise trying a stock shaft to ream it because it has a real nice taper built into it.

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The installation tool.

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And worth every penny that it costs....

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I took a well used dist shaft and made a groove lengthwise in the shaft. It only took a few turns and the groove cut the excess material out and it was a perfect fit.

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I have installed at least 5 or 6 of those bushings over the years and don't remember having any problems doing it. I don't know what the big deal is with the tool?

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Ive put in 5 of them over the years without a tool. No problems.

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I have installed at least 5 or 6 of those bushings over the years and don't remember having any problems doing it. I don't know what the big deal is with the tool?

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Ive put in 5 of them over the years without a tool. No problems.

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Same here...

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fwiw, my experience has been that the mp 1s are tight, but the pioneer brand 1s i've used don't need purnished. dave

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fwiw, my experience has been that the mp 1s are tight, but the pioneer brand 1s i've used don't need purnished. dave

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This has been my experience as well. I've been told you can use an old oil pump drive to drive the tight ones in and then knocking it out burnishes it enough to allow the shaft to spin. A light polish on the shaft will help gain the clearance you would need if it's tight.

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That's what I said, and have done. Nobody had to tell me, I figured it out on my own, like 20 years ago when I was 20 or 30.

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Anyone see a prob w epoxying the OD of the bushing b 4 you drive it in, more security

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Let us know how it works. No need to over think something as simple as installing the bushing.