1968 camaro convertible, mast f body oil pan with remote oilt cooler plumbing.
which port should flow to cooler and which port to flow back?

 

Im sure there is an in and out at the oil pan, but does the cooler specify which port is in and which is out?

IMO its not gonna make a hill of beans difference if the only thing its going to is an oil cooler. Just pick a port from the pan and stick it to the cooler then from cooler back to pan. The coolers usually dont have a flow direction so it shouldnt matter.

 

I used the Mast pan with a stacked plate cooler on mine -- to Lsxford's point, I just hooked 'em up in a way that made it easiest to route the lines/looked the best. Have no idea which way oil is flowing through the cooler. But it works just fine.