All the 318 had the same bore from beginning to end, stock is 3.91. correct scope
All 340, 1968 to 1973 had 4.040 bore size, correct? Me thinks that the 340 piston will never fit in a 318, will they work
Another dummy trying to off his junk as something special tsk twocents

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)