Here is a pic I've been meaning to post since Memphissenior was talking about using offset keys to achieve cam advance/retard. The offsets arent available anymore, but this is better. Only one company makes these, located in Australia. It has as you can see multiple keyways for something like 9 different advance/retard settings. The chain is a roller chain and wont stretch like to old link chains. A degreed cam done with the OEM sets could end up 1 1/2 degrees retarded from original settings in just a few hundred miles due to chain stretch. There was an additional surprise. When I checked the weight of this set compared to an OEM variety, this is 20 ounces lighter.
Advancing the cam will move the torque curve into lower rpms. So at this point the plan is to advance the cam 2 or 2 1/2 degrees. If the rpm range would shift from the advertised 2000-5000, to 1900-4900, that would be just about perfect for the objectives and final drive ratio.

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46 1/2 ton with 56 292:thumbsup: