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Old 03-09-2017, 04:24 PM   #1
turp mcspray
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WTB water pump pulley

Looking for a 2 groove big block pulley.
3995648
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Old 03-09-2017, 05:55 PM   #2
GR8-68
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Re: WTB water pump pulley

I think I may have one I will check and see
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Old 03-11-2017, 11:26 AM   #3
turp mcspray
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Re: WTB water pump pulley

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Originally Posted by GR8-68 View Post
I think I may have one I will check and see
Did you get a chance to look for a pulley?
Thanks.
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Old 03-11-2017, 01:38 PM   #4
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Re: WTB water pump pulley

I have this one
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Old 03-11-2017, 02:26 PM   #5
turp mcspray
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Re: WTB water pump pulley

That isn't the one. Can you post the number on it, for reference? The 648 pulley has both grooves, the same diameter. Thanks!
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Old 03-12-2017, 09:45 AM   #6
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Re: WTB water pump pulley

I have a 2 grove water pump pulley 3995646
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Old 03-12-2017, 10:00 AM   #7
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Re: WTB water pump pulley

I looked through my other stash and only have single groove pulleys, I didn't see a number on the one I posted
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Old 03-12-2017, 01:49 PM   #8
RogerKoop
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Re: WTB water pump pulley

Part no. 3927789 was changed to 3995648 some time in late 1971. So either number may work. This pulley was used on a number of GM cars and trucks. It was used on 6 Cyl as well as 8 cyl. May you can use this info to help in your search
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Old 03-12-2017, 03:59 PM   #9
turp mcspray
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Re: WTB water pump pulley

Thank you! I knew that there was another number, but didn't know what it was.
The diameter of the pulley is 6 1/4", the 646 is 5 3/4".
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Old 03-12-2017, 06:08 PM   #10
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Re: WTB water pump pulley

I know I have a full set in my cabinet, I'll look and see if I have a lone water pump pulley.
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Old 04-30-2018, 05:47 PM   #11
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Re: WTB water pump pulley

Quote:
Originally Posted by leddzepp View Post
I know I have a full set in my cabinet, I'll look and see if I have a lone water pump pulley.
Hello, did you ever find this pulley or sell it ? Please let me know & Thanks !
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