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Click on image for the lowdown. 
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| | | Forums66 Topics128,012 Posts1,055,317 Members48,419 | | 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!
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#56754 02/21/2006 10:47 PM | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | GMC went to full-pressure oiling and insert bearings in the late 30s when the 228-302 engines were designed. They also used higher nickel-content iron in the blocks. Just look at GMC gauges - the have 0-60 psi readings, rather than 0-30 psi. | | |
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