any way to know if my 318 has 340 or 360 heads?

70aarcuda said
I have a U head that says 360 on it...it came on a 70 340...........

All 915s cast O U and J all say 360 on the head but did come factory on 70-71 340s w 2.02 valves. Not all Js are 2.02s though. All the Js ive actualy pulled off of 360s have all been 1.88s