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I asked the same question a few weeks ago, foud this on VPW website...
Quick Tip 9:
Ignition Distributors
Can I interchange ignition distributors without a problem? It depends on the block measurement: distributors are interchangeable between same length engine blocks but are not interchangeable between different length blocks (i.e. 230 vs. 251). Longer block engine (237, 251, 265) distributors have a drive tang approximately 1/4" longer than shorter block engine distributors (201, 218, 230). If you happen to be converting your M-37 truck to 12 volt, a 12 volt distributor with the proper length drive tang will interchange. However, in addition, you will have to change to a civilian oil pump to mate with your new distributor shaft. M-37 distributors as well as the corresponding oil pump have an offset tang (not centered) which prevents the distributor from being installed 180 degrees off Top Dead Center (TDC) on number one and number six cylinders.
Quick Tip 9:
Ignition Distributors
Can I interchange ignition distributors without a problem? It depends on the block measurement: distributors are interchangeable between same length engine blocks but are not interchangeable between different length blocks (i.e. 230 vs. 251). Longer block engine (237, 251, 265) distributors have a drive tang approximately 1/4" longer than shorter block engine distributors (201, 218, 230). If you happen to be converting your M-37 truck to 12 volt, a 12 volt distributor with the proper length drive tang will interchange. However, in addition, you will have to change to a civilian oil pump to mate with your new distributor shaft. M-37 distributors as well as the corresponding oil pump have an offset tang (not centered) which prevents the distributor from being installed 180 degrees off Top Dead Center (TDC) on number one and number six cylinders.
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