Great Forum Guys.
My question, I have recently purchased a 20 1/2 Ft Carribean with a 540 engine. Do not have many of the build details as the previous owner did not do much engine work himself. Engine has hydraulic roller cam and roller rockers. Under hard acceleration from stop, the oil pressure will drop about 20 psi. It will come back when the boat is on plane and no longer accelerating. Once on plane if engine is held above 4500 Rpm for 3-5 minutes, the pressure will start to drop again. Reducing engine speed to 3500 Rpm or less will let the pressure come back up. The engine came with a box type Milodan pan. I am guessing the first pressure drop is caused by the oil being thrown to the back of the pan and the oil pump is sucking air. The second may be due to windage and or oil not draing back to the pan. Oil temp at this point has never exceeded 130 degrees and is about 40psi with 20W50 oil. I am pulling the engine to change the pan to one with scrapers and windage tray, check brg clearances, change as needed, and replace the oil pump. Do not intend to put high volume pump as boat is primarily used for pleasure. Since I will have the engine torn down to a short block, is there anything else I should be looking for?