I think the cams are the same for the 140 and 150, Piper marked 150 on one end. From my experience, the inlet cam on the 140 is retarded a fair bit, which I think is to do with the long inlet tract. When I tried to advance it to a more normal figure, the engine lost some bhp but gained a little torque. I then upgraded to dthtb and the shorter inlets needed the figure around 110 to develop max bhp. The exhaust did not seem to have so much effect. Both figures could be correct, depending on plenum or throttle bodies.