As Dr. Toth has schooled me,
I am now pleased to recite his information as one of his faithful followers:
The dimple on the 427 flywheel is not the TDC mark, it is actually set at 10-degrees BTDC at the centerline. The dimple has a range of 9.5 to 10.5 from side to side, and it is recommended that the setting be at 10.5 or the leading edge of the dimple.
From the Chris Craft 427 Owners Manual:
To set the ignition timing use a timing light. The flywheel is provided with timing mark on it's rim and an ignition timing indicator is positioned over the flywheel ring gear. With the timing light connected to the battery and No. 1 spark plug (starboard side at the front end) and the engine running at idle (500 RPM in gear) rotate the distru8butor so that the timing light shows the flywheel timing mark directly in line with the ignition timing indicator. Recheck ignition timing after tightening the distributor to be sure it is properly set.
And of course, if you do this in gear at the docks, be extra double sure you have plenty of lines attached to lots of hardware, because if the big dogs rip the hardware off and your boat lurches forward in gear, you could be in big trouble. I do not (NOT) recommending doing this with the boat in gear tied to the docks for this reason, it is very hard on hardware, and it is also potentially dangerous.
Regards,
Paul
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