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Click on image for the lowdown. 
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7 members (NJC, klhansen, kades51, MRMEROTH11, Eisenholtz, TexasA&M48Truck, Wickedbass),
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guests, and
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robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,066 Posts1,055,875 Members48,428 | | 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!
| | THANKS!
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: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | As I just said, the late (larger) pump turns 95% of engine speed with the original pulleys.
The early (smaller) pump turns 140% of engine speed with the original pulleys.
This information is all in the factory service literature. | | |
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