Water pumps. Which one would you buy? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-30-2007, 10:53 AM   #11
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I bought a new, unopened Delco water pump last month, #12482919/GM #251-545 (stamped # on the actual pump housing is 12564115) and the blades look similar to those on the pump on the left.
Did someone rip me off?
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Old 03-30-2007, 11:27 AM   #12
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I like the machined gasket surface on the right one. I'd buy one just for that, then I'd set it on my desk at work and admire it all day. ...where'* my wallet?...
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Old 04-02-2007, 11:35 PM   #13
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It would seem AC Delco went through a re-design.

This is the OEM water pump that just came off the Zilla:

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Old 04-02-2007, 11:41 PM   #14
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Wow, go figure! Thanks for posting!
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Old 04-03-2007, 04:52 AM   #15
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Quote:
Originally Posted by willwren
It would seem AC Delco went through a re-design.
New one looks like a definite improvement. I just installed one of the stamped ones a couple months back
I remember years ago (in 96?) I had trouble finding one. Some of the aftermarket ones that NAPA was selling back then had the impellers mounted on the shaft crooked and were rubbing the casing. I had to open several boxes before I found a good one.
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Old 04-03-2007, 07:53 PM   #16
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Willwren

Does the pump on the right have a solid cast iron impeller?

On my old 1970 cutlass swapping from a stamped to a cast impeller dropped idle temp a solid 5*.
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Old 04-03-2007, 08:28 PM   #17
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It is solid cast. And the measured/roughly calculated surface area of the impeller blades is quite a bit more. This pump will flow about 15-20% more than the Chinese pump pictured at the beginning of this topic, and the old OEM that I removed last night.
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Old 04-03-2007, 08:31 PM   #18
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So your 10% underdrive pulley will now flow to ~5 to 10% above normal?
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Old 04-03-2007, 08:36 PM   #19
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Not basing this on angle, nor have I accurately measured the diameter. Hard to say until I get to a more quantitative analytical anal retentive analysis.
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Old 04-12-2007, 09:47 PM   #20
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If I order it from GMPD, do you think it would be cast or stamped?
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