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Author Topic: GM Big Block Aluminum Water Pump  (Read 11285 times)

dino67

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Re: GM Big Block Aluminum Water Pump
« Reply #15 on: February 13, 2015, 01:51:48 AM »
Thanks for the info on the 3975928 water pump. I've been using it on my 67 L78 for years also. It has the 5421 stamping too. I always wondered if it was an over the counter part or a factory part. Thanks for the input.
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bergy

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Re: GM Big Block Aluminum Water Pump
« Reply #16 on: February 13, 2015, 12:02:01 PM »
I've had one of these pumps on the shelf for many years.  Must be an early one with (no date).  Question for you guys who are running these pumps - do you find that it improved cooling?
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dino67

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Re: GM Big Block Aluminum Water Pump
« Reply #17 on: February 13, 2015, 08:11:08 PM »
I never had any  over heating problems, but can't say it cools any better or worse than a cast water pump. 
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cook_dw

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Re: GM Big Block Aluminum Water Pump
« Reply #18 on: February 13, 2015, 08:15:49 PM »
No real advantages other than weight.  Cools the same in my application but I run an electric fan so....
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twol78s

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Re: GM Big Block Aluminum Water Pump
« Reply #19 on: February 14, 2015, 04:47:13 AM »
The one on my 67 L78 seems to move coolant just fine. Never had the original cast iron pump on it, so I don't have anything to compare with,  though.
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