The inside of the 440 source swinging pick-up is extremely rough - the casting is no where near the quality of the milodon - if you are going to use it spend some time cleaning the inside of the pick-up to improve the flow. I have had two of them and they work good after you clean them up - but I would not use one as cast. The oil pump cover is a pretty good piece just bulky and still has the two piece construction but with o-rings- no green gasket of death. We switched to the new milodon one piece covers and pumps pricey but worth the peace of mind. I don't believe the Milodon swinging pick-up design ever had an O-ring and it does have stops built in to limit the sweep - you want it to move freely in the pan.