Seems like it would be pretty easy to measure the amount of torque required to turn the cam with the valvetrain fully assembled. Also seems like it's possible that it could be slightly different in a running engine with the the gasses flowing, compressing, combusting etc. whatever forces that may exert on the valves.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear
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