This part is mandetory if connecting an external oil cooler to a Gen VI big block Chevy 427, 454, 502 engine to the factory oil cooler ports on the oil pan rail of the block. Without this part, the oil cooler will not be functional. This part is designed like the factory quick connect design so that it blocks off the upper oil gallery that the oil cooler port intersects.
This part threads into the port on the oil pan rail closest to the oil filter.
This fitting is the pressure supply to the oil cooler.
The return line (port farthest forward) can be a standard 3/8" NPT to 10AN adapter fitting.