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Click on image for the lowdown. 
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| | | Forums66 Topics128,031 Posts1,055,435 Members48,422 | | Most Online14,466 Apr 26th, 2026 | | AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Yes, you can use the 261 harmonic balancer as long as its groove width matches the grooves on the alternator/generator pulley and the water pump pulley.
Jim Carter has the older style pump with either 3/8" or 5/8" pulley.
Get an older-style and a newer-style water pump gasket (no matter what the instructions say about the need for gaskets).
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