#1  
Old 10-12-2020, 09:03 AM
ramairhart ramairhart is offline
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Location: Deep Southern Ill
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Default 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

  #2  
Old 10-13-2020, 03:21 AM
Geoff Geoff is offline
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Good move. See about pulley ratios, here:

www.stewartcomponents.com

  #3  
Old 10-16-2020, 09:55 AM
78w72 78w72 is offline
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Quote:
Originally Posted by ramairhart View Post
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".

  #4  
Old Yesterday, 08:56 AM
ramairhart ramairhart is offline
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Join Date: Feb 2006
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Default Water Pump Pulley

Quote:
Originally Posted by 78w72 View Post
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

  #5  
Old Yesterday, 11:13 AM
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Hikin Mike Hikin Mike is offline
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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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'69 Firebird 400 - Goldenrod Yellow, 455 +.060, '6s-7' heads, Comp Cam 276AH-10 (51-309-4), TH400, Ford 9-inch w/3.08, 800cfm Q-jet, Stock Intake, Hooker Headers, Flowmasters
'68 Coronet 500 Convertible - Medium Gold Metallic, stock 318 +100,000 miles

Last edited by Hikin Mike; Yesterday at 11:24 AM.
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