Cast or Alum.heads for racing.

pettybludart said
My 340 in my 73 Dart Sport has a small stroke(372)with X heads P@P when it was dynoed it put out 452hp,440ftlbs.or torque.Maybe I should start looking for another pair of X or J heads,I,d like around 550hp.

if your wanting another set of x's or j's i would just run the eddys that way you could run a little more comprssion on the same octane vs iron heads