511. When i was putting it together, there where a couple engine builders that said the 1/2" pick up mod was not worth the trouble and really not needed. I asked about that at the time. I just ordered all the fittings and hose to step up the oil cooler flow as i was not comfortable with the -8. Thanks for the heads up on -8 hose not being enough. Gonna run it and ill let ya know if it starves for oil. I wouldn't think it would matter cubic inch or BB or SB. The oil galleys are the same size. Seems to me there are plenty of SB spinning 7500-8000 rpm using a 3/8 oil pick or am i missing something here? I bet you could ask right here how many are using a 1/2" pick up in the BB stroker and you wouldn't find many. I do appreciate the help, thanks