1972 demon

hi, performance between the two is not much difference. the 72 340 was way under rated. the comp diff. and smaller int valve didn't hurt it all that bad. retains same intake and port sizes are same. cam is same grind.
the 72 340 is very competive is stock eliminator. the 70 340 and 72 340 do run same class. the 70 340 has a smaller carb on it.