RB 440 Oil Mods [Blocking off top of motor]

this will work better for you. drill and tap 1/8" set screws in each passage to the heads. seal with loctite. turn #4 cam bearing upside down and drill new hole to feed the main. use full grove mains. this will supply full time oiling to the main and rod on each side. these are the two rods that will spin their bearing when oil supply is low. this will also provide full time oiling to the rocker gear also. now if you think you have too much oil up top tap and install a carb jet of your choice or tap the passage at the deck and install a 1/8" pipe plug with a hole drilled in it the size you need to hold down the oil supply.