Pistons, Hypereutectic, Flat, 4.050 in. Bore, 5/64 in., 3/32 in., 3/16 in. Ring Grooves, Ford, Set of 8 For Ford 360/390 engines. We bought these and sent them to the machine shop with a 390 we were building that we had sleeved to standard bore. Our customer changed his mind before any work started and decided he wanted to add a supercharger and change to Forged pistons so these were never used. So you can get a $272 set of pistons for less than half price because we just don't build many FE engines here and they will just sit on the shelf.