Jeep 134 1946-1968 Flathead + 1953-1973 OHV Sealed Power Cast Piston Set/4 STD 1953-73 Jeep LD Trk "Hurricane" F-Head 1946-68 Jeep LD Trk "Lightning" L-Head 1941-42 Jeep LD Trk "Lightning" L-Head Bore: 3.125" (at STANDARD); Ring Lands: 3/32"-3/23"-3/16" Casting #'s: 5350690, 75622N, 801248