Randy, disassemble your head and check out the seat area.....the only time the intakes require seat inserts is when they have been sunk (abuse or incorrect grinding)....normally the exhaust are up-graded with inserts for unleaded fuel compatibility; not required on the cooler running intakes.....if the intakes don't have inserts they can be ground for the 1.94 even if they are down a bit with the 1.72......fats
