I’ve had a non running ’53 Gold Pennant 10 for several years now but have never looked under the hood. If you don’t get a reply, I can always go over and take a peek at it.
On OMC ignition cams the Keyway is at the thickest part because it is less likely to crack if mis-installed. This coincidentally is also the start of the high point of the cam. . . . 😆
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Thanks, guys. There is a generic reference to using the key way in the Scott Atwater Service manual, but it isn’t specific to a particular model or magneto option, so I just wanted to double check. Seems about right, but I’ll check a couple other spots along the cam with my feeler gauge just to be safe.