Looking down through the thread, there were a couple references to Magnum 52 four strokes not having the power of a 46 two stroke.

I've seen a lot of the Magnum four strokes with less than satisfactory power.

These poor performing ones I've personally looked at had the cam timing advanced one tooth. This gave a great idle but took the engine performance down one prop size.

These engines when the piston at top dead center had the cam timing mark straight up and down. Either 6:00 or 12:00. And this was from the factory!

The proper timing position is in alignment with the push rods. Preferably with the mark dead center with the exhaust cam follower hole.