My Cozy was built using the engine I had on the shelf - an IO-360-A3B6D. The codes mean my engine left the factory as I Fuel injected 0 opposed- 360 360 cubic inches of cylinder volume – A type A sump 3 propeller locating bushings rotated 120 degrees clockwise B with an accessory section using Bendix accessories 6 (1) sixth and (1) eighth order crankshaft counterweights D (1) Bendix D4LN-3000 impulse coupling dual magneto Attached is a write up of modifications made to fit this engine to the Cozy. The angle valve wide deck sump is above the induction chamber, with wings to the right and left. Both wings are tapped 1/2" NPT for oil drains. The standard Lycoming plug has a square head. On one side I installed a stainless plug that uses a recessed hex head / Allen key. On the other I installed a Fumoto engine oil drain valve (p/n T202N) with the lycoming engine thread of 1/2-14 NPT. Spring loaded and brass, vs the standard springloaded and aluminum. This is brass going into aluminum - a strong hand tight is sufficient! Use safety wire for peace of mind. I also have a 1/2" id plastic tube and a solid plug. To drain oil, roll the left wheel onto a ramp, attach the hose, put the drain end in the pan, remove the hose plug, and flip the switch.