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Click on image for the lowdown. 
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| | | Forums66 Topics128,101 Posts1,056,181 Members48,436 | | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | What year truck and what year/application engine?
Shop Manuals show settings ranges from 400 RPM (1937) to 450/475 RPM (1962).
Sometimes it depends on equipment on the truck/engine and the size of the truck.
Patrick's advice is good. | | |
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