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Click on image for the lowdown. 
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| | | Forums66 Topics128,081 Posts1,056,078 Members48,434 | | 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: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | Far more important: that's also the water pump RPM. Slow it down too much = always runs hot.
Fan speed only matters in traffic, above 35 mph you can remove the fan entirely.
The best fan design: the largest diameter turning at the slowest speed, with a shroud. | | |
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