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Click on image for the lowdown. 
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| | | Forums66 Topics128,052 Posts1,055,770 Members48,426 | | 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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| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | 1941 has flat top pistons.
1940-41 cranks, which are the same, have a larger flywheel pilot than 1942-62 and use 3/8" retaining bolts, 1942 and up are 7/16".
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