>> . . . modified camshaft to maximize torque at 2,500 rpm. <<

 

So… you put in a standard camshaft.  Right?  

 

Seriously,  the standard CAM in a Lycoming engine already has the torque maximized at 2500 RPM.  If somebody asked you to pay extra money for that purpose - - well,  never mind.

 

That knowledge comes from doing engine certification runs on IO-360 engines.

 

Regards,  George