360 heads on 318

If you look at the application years the were used on 360's before they were used on the HP318 so I would say they have the 360 chamber size. Could be that the HP318 used a special piston? or Mopar like us realized that just about any casting number head has casting variables. If I remember right there is only supposed to be a 5 or 6cc difference anyway between the 318 and 360 heads. Milling will fix that difference. I have a 318 w/360 heads in a pickup and that thing runs better than my 318 w/318 heads in a van I have. I believe the added flow of the heads makes up for the little lose in compression if there is any.

Chuck