Putting on a snorkel doesn't cause an engine to start burning oil.
Just in case, check for oil in the airbox, under the filter.
144-148 DynoJet jets are BIG. Do you have an exhaust system and cams/pistons, etc?
2002 665 Prairie
FPS 12:1 pistons
FST Stage II Cams
Other weird stuff
2011 Stratos 186XT Bass Boat
Mercury Optimax 115hp
Minn Kota 70lb 24v trolling motor