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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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| | | | Joined: Sep 2009 Posts: 6,022 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 6,022 | Jerry - A quick scan through some Chevy books shows the following general details about the rear main journal diameter:
The large journal cranks have 2.650" mains. These were in the 400 cubic inch small blocks only. *
The medium journal cranks have 2.450" mains. These were in the small blocks starting in the 1968 and later model years. (1968 Chevy Truck Overhaul Manual says = 2.4479" - 2.4488")
The small journal cranks have 2.300" mains. These were in the small blocks built before 1955-67. *
* Granddaughter showed up for the day so I didn't have time to check actual books for details like found for the '68 and later cranks.
Hope this helps.
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
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