Olds water pump/impeller

pizza442

Not-quite-so-new-guy
Sep 9, 2017
13
3
I've always understood that the 'disc' impeller was ideal (and OEM?) vs. the 'vane' or fan-like impellers. Opinions? And when I take my original pump off my 86 442 will I find a disc impellor?
1601060615778.png
1601060644310.png

1601060693490.png
 
Oct 14, 2008
6,382
113
Melville,Saskatchewan
It SHOULD be the enclosed vane impeller. Anything with A/C and heavy duty cooling had the enclosed impeller. I pulled a nice cast iron one off a 260 and used it on my 350.
 
  • Like
Reactions: Rktpwrd
Oct 14, 2008
6,382
113
Melville,Saskatchewan
This the one I got for my 403 with AC and HD cooling
Pretty much the only enclosed impeller pumps being made are Flowkooler. They used to just rivet a plate on the open impeller, leaves a bunch of room between the impeller and body. Mine did nothing to help cooling, would not surprise me if it made it worse. Now they have a nice CNC close fitting aluminum impeller that no doubt works better. You want more flow with less cavitation, a tight fitting closed impeller should do that.
 

Drkuhar

Master Mechanic
Sep 27, 2018
297
63
Watch aftermarket pumps.for finned impellers that are too small for the bevel. They do not cool right. I found 2 at autozone with the same part number and the impeller fins were about 5/16 shorter on one vs the other
 

Please support GBodyForum Sponsors

Classic Truck ConsolesDixie Restoration DepotMike's MontesP-S-TSouthside Machine PerformanceUMI Performance

contact[email protected]for info on becoming a sponsor