One other point I'd like to comment on is that of oil flow volume and just how much oil volume must be handled by the sump cover and drain back system. Some calculations were done in earlier posts that showed the volume could be up to 21 gpm. The pump has losses and the already mentioned aeration bypass ports internal to the pump would reduce that volume by some amount. I was driving my GT a few days ago and took note of the oil pressure vs RPM. It isn't hot weather here now so the oil temp only got to 202F to 210F. The oil was Amsoil 20W 50. Idle RPM of 800 gave me 35 psi. The max oil pressure goes to 100 psi with hot oil then the pressure relief valve maintains that pressure. I get to 100 psi at 2400 to 2700 rpm. 2400 with oil temp 202 and 2700 at 210F oil temp. Oil that the pump supplies is bypassed at RPM above that. This tells me that the oil volume, at 100 psi, the engine uses is what the oil pump supplies at 2200 to 2700 RPM. With hotter oil the RPM for 100 psi would higher, depending on the oil. The engine uses, and the sump drain back system needs to handle, the oil volume the pump supplies at around 3000 RPM max. The remainder is merely bypassed and doesn't go through the engine. The engine use volume is nowhere near 21 gpm. Maybe 8-9 gpm.