Standard,here's how I run my setup,now keep in mind I use 2 water dumps out the boat to keep block pressure down,no need for a psi regulator!...I also use and like the REX Marine Thermostate kit,(works great).O.K....out of the pump,5/8 hose with a ball valve at the pump, the 5/8 main feed hose runs under the motor,then into a T were each line then goes to the front of the engine,(water pump inlet's)Screw in T's each side.Stay with me.5/8's out off those T's and they go to the top of the REX Tower,(2-upper,2 lower),Now the lower ports,REX TOWER just get dumped out the back,all 5/8'hose...Now to feed the Headers,off of the Main supply out of the pump (5/8's) I tee'ed off with a 1/2 hose,that runs into the BASSETT-TEE,out of the T down to 3/8 hose and into the Header feed lines.I also use a ball valve on the 1/2 header line and 2 3/8 ball valves at the injection lines,this gives me total control of the psi to even flow to the headers.This setup workes great for me,I'am sure other's may do it differnt.