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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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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#51548 10/27/2005 2:09 AM | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | 1937-40 216 pumps only have one water hole where the water flows into the block, 1941-54 have two. The bolt pattern is also different.
1940 was the first year to use a rear main seal and a six bolt flywheel.
1940-41 flywheels are the same but use 3/8" mounting bolts and have a larger center hole than 1941-62.
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