wet or dry refers to lube oil storage. wet means the oil is stored in the crankcase. dry means the oil scavenged from the bottom of the motor and is stored in a remote tank. Dry sump typically will make more power beacuse of the lack windage by the crank. (the crank won't encounter oil in the air as its spinning, less resistance)
Also, without the crank whipping thru the oil, you don't get aeration of the oil. Another bonus with the dry sump, is that the sled can be operated at an angle & because there is no oil pump pickup, you don't have to worry about the oil pump sucking air.
A while back there was some discussion about the AC 4 stroker not to be operated on a side hill (?)
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