Some of the Alternators were clocked wrong as received from the factory (with Power Steering). My car was one of them.
If the alternator is clocked correctly on the rear (as regards the Hot Terminal being in the 3:00 Position and the "Two Wire Connector" Boss being at 12:00 position) then you can adjust the alternator inboard all the way to the end of the slot (shortest belt) or outward to the end of the slot (longest belt) without contacting the Valve Cover.
Ideal location would be at the middle of the slot (farthest away from the Crank Pulley) which actually pulls the belt around the Alternator Pulley.
My car had the alternator clocked wrong and an electrical short thru the aftermarket valve cover happened, a very expensive mistake in the 1966 timeframe.
If the clocking of the Power Terminal had been correct it never would have happened (even with aftermarket 1963 ribbed M/T Valve Covers).
So the Clocking Comment and the Upper Alternator Boss position in the Slot, I agree with. I have very little faith in the old magazine pictures as being correct, as many magazine cars were played with by Royal and other dealerships.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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