I was having issues with my oil pressure trailing off at road speed. Idle was fine however, I did some research and found that the press relief valves in the header may be the issue and seemed likely. I swapped to a used one I had lying around and it got worse. Called my local Ford truck center and they wanted 500+ dollars for this piece without gaskets / seals! Looked it up with clay, got it in 3 or 4 days and installed. Oil pressure is right back where it belongs and trucks back on the road! Another RiffRaff win!

This piece fit correctly, the filter screwed onto it just like its supposed to. I'd buy it again if I had to

This is the Ford OEM replacement oil cooler header. It fit perfect.