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Click on image for the lowdown. 
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| | | Forums66 Topics128,075 Posts1,055,918 Members48,429 | | 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: Jan 2009 Posts: 38 New Guy | | New Guy Joined: Jan 2009 Posts: 38 | I just got an old 51 GMC. What is a safe cruising RPM for the ole GMC six? My AMC 258 and the Ford 300 could safely run 3000 rpms all day long. Someone told me that those old GMC motors don't like seeing anything higher than 3000 rpm. | | |
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