There are a number of these billet thermostat housing on the market. I've looked at each one of them in detail. I selected and purchased the one from Riffraff Diesel as I particularly liked that the holes for the screws were counter bored so that the screws when installed sat just below or level with the flange surface. Additionally, I like that RiffRaff Diesel includes with the thermostat housing the three high quality stainless steel hex head cap screws. Of course the fit and finish was excellent and installation was a breeze. Looking back, I should have bought this Billet Thermostat Housing from RiffRaff Diesel when I first acquired my truck instead of wasting money buying the cheap stamped steel thermostat housing from Ford each time I performed a coolant flush as the Ford OEM housing rusts and corrodes and can't in all practicality be reused.

Simple upgrade and well designed.

Riff Raff always has the best products with perfect fitment. This housing is no exception.

Replaced a rusty outlet when changing out the thermostat and upper hose. Worked great without any issues.

Great part. Great fitment. Unbeatable price. Super fast shipping. There is only one place to go for your PowerStroke. The part went on great, no leaks. No problems.

After multiple failed attempts and leaks with new parts house thermostat and housing I decided to spend the money and get the billet housing. With coolant being nearly $20/gal I should have done this mod first! No leaks what so ever...very nice piece. I would recommend the oem motorcraft thermostat as well with the built in gasket. All in all very pleased. My only gripe is the hex head bolts but that's neither here nor there. I was told it was a 3/16 hex, but I found a 5mm to fit more snugly.

Buy this and it’s for life. Done. I’m out..

was a great replacement for that old steel stock unit.

Against every warning, I went cheap and bought a T-Stat housing from one of the common automotive box shops. 2 failed attempts to get a good seal with RTV later, I finally did what I should have done in the first place. This thing epitomizes the strength and reliability of the engine that it was designed for. Save yourself the extra time and wasted money.