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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!
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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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