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-   -   Water pump pulley (https://forums.maxperformanceinc.com/forums/showthread.php?t=844830)

ramairhart 10-12-2020 09:03 AM

Water pump pulley
 
I’m looking to replace my 8” pulley with 2 7/8” offset with a 6 3/4” pulley with the same 2 7/8” offset. Any info would be greatly appreciated.
Thanks
Alan

Geoff 10-13-2020 03:21 AM

Good move. See about pulley ratios, here:

www.stewartcomponents.com

78w72 10-16-2020 09:55 AM

Quote:

Originally Posted by ramairhart (Post 6185996)
I’m looking to replace my 8” pulley with 2 7/8” offset with a 6 3/4” pulley with the same 2 7/8” offset. Any info would be greatly appreciated.
Thanks
Alan

what year engine do you have? i have a few mid 70's w/p pulleys from 2nd gen firebird 400/455 engines but they all measure closer to 6.5".

ramairhart 10-19-2020 08:56 AM

Water Pump Pulley
 
Quote:

Originally Posted by 78w72 (Post 6187231)
what year engine do you have? i have a few mid 70's w/p pulleys from 2nd gen firebird 400/455 engines but they all measure closer to 6.5".

69 Firebird with 400. The 6 1/2” pulley would be fine as lone as it has a 2 7/8”offset.
Thanks
Alan

Hikin Mike 10-19-2020 11:13 AM

Sounds like you need a 9799128. Butler sells them new: https://butlerperformance.com/i-2468...l%3Fq%3Dpulley

I had the earlier water pump (4"), and a smaller pulley on my 69 Firebird, but the wrong offset. I changed to the larger water pump (4-1/2") and found a 9799128 pulley from a Facebook Marketplace Pontiac Group a few weeks ago. You can check e-Bay as I've seen them recently, and you might try getting a hold of member 'ol Pinion head', but he's seems to be missing lately.


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