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Mod | | | Forums66 Topics128,014 Posts1,055,327 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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#20705 05/16/2003 4:51 PM | Joined: May 2002 Posts: 44 'Bolter | | 'Bolter Joined: May 2002 Posts: 44 | Does anyone know what year GMC engines changed from the 4 bolt flywheel to the 6 bolt flywheel??? It may not be a year change but a change found in different truck models??? Any help would be great!
"The Operation of GMC trucks is normally smooth and steady, with no loud rattling, knocking or unusual noises. A good driver will quickly become accustomed to driving a GMC truck and will get the feel of his vehicle regardless of his engineering knowledge."-TM10-1563
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#20706 05/17/2003 3:20 AM | Joined: Oct 2001 Posts: 194 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2001 Posts: 194 | Just a guess here, but I think the smaller engines, 228, 248 and 270 had four bolt flywheels. I think the 302 had the six bolt flywheel. :rolleyes: | | |
#20707 05/17/2003 4:24 AM | Joined: Jan 2000 Posts: 206 Member | | Member Joined: Jan 2000 Posts: 206 | 302s all had 6-bolt cranks. Not sure about 270s but I've never seen one with 4 bolts... But by late 1954, all GMCs were 6-bolt. By that time 228s were history, so anything 55 -1st series and later will have the 6 bolt crank. | | |
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