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Old 05-22-2007, 05:35 AM
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High flow water pump for SBC 350

I'd like to swap to a high flow water pump on my SBC 350. Its a GMPP 350, almost identical to the original '75 vintage 350 that it replaced, except for a more aggressive cam. I need a long pump with standard rotation.

By the way, I already have a 3 row radiator, thermostatic clutch fan and stock shroud. However, I live in San Antonio and would like to start using my AC again this summer. The AC puts a lot of heat load on the engine when temps approach 100 degrees and I want to have as much reserve cooling capacity as possible.

Prices on high flow pumps range from about $65 to $200. Some of the difference is for polished finishes, but I'm looking for performance and reliability differences.

For example, other than weight, is an aluminum pump worth the difference in price? Also there seems to be a debate on whether the impeller should be cast or stamped steel. Some pumps also claim to have flow at low speeds, but return to normal flow at high speeds.

Any recommendations on a good high flow pump in the under $80 range?

Thanks,

Bruce

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Old 05-22-2007, 06:05 AM
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Flowkooler makes some of the better high flow water pumps. If you not willing to spend the bucks on a new high flow water pump Flowkooler also makes an impeller modification kit that transforms a stock pump into a high flow unit.

Vince
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Old 05-22-2007, 08:40 AM
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Stewart water pumps are excellent, a stage 1 is probably all you need.
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Old 05-22-2007, 08:51 AM
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You'll be amazed at the lack of difference.

I know I was
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Old 05-22-2007, 09:10 AM
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Like Rick said - a Stewart Stage 1 is a good unit for around $80. Check out their website as they have some good reading.
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Old 05-22-2007, 10:39 AM
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Stewart Components !!!

This is by far the best cooling pump I have ever used, 40 years of testing SBC with A/C in the So. West Desert of Arizona. Be sure and get there high flow thermostat also!!
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Old 05-22-2007, 03:12 PM
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It sounds like the Stewart stage one and high flow thermostat might be a good choice.

Does anyone know if any of the common chain auto parts places (Autozone, Advance Auto, Pep Boys, etc.) carry Stewart products, or will I have to do mail order?

Thanks,

Bruce
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Old 05-22-2007, 03:42 PM
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I HIGHLY doubt it, and they certainly would not stock it. Jegs or Summit would be your best bet. Stewart tech service is top notch as well, in case you have any questions prior or after ordering.
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