Bob Aller Oil Pump Rebuild

Posted by humanpotatohybrid On 2024/3/26 12:17:58

Ok, so I know there was a LOT of spirited oil pump discussion back in the day. I don't want to re-hash any of that. Put simply, I think we can all agree that the Olds conversion is a cure-all and the factory pumps (especially after xx,000 miles of wear) tend to be inadequate. However there are two promising options in the middle:

-Ross's input shaft lube port modification
- the Aller conversion

I'm skipping over the various old mods that no one likes such as the reinforced bottom plate.

Anyway, does anyone know exactly what the Aller rebuild was? I ASSUME you would turn down the input shaft slightly and bore out the bore slightly to accommodate the installation of a new bushing to take up the tolerance. But I don't know.

Or, let me put it this way. I have 3 oil pumps, of which 2 might be decent. I would rather spend $0 or $20 for a bushing to do a decent fix than $400 on a perfect fix on a car which won't be driven very often. What would you do?

Edit: Aller pump pics