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Where is this stated in Nhra about aluminum heads?



All I see is in the 1968 classification guides shows a 10 HP increase for the Street Hemi in SS, 5 HP in Stock. What I see, the Race Hemi has the same HP of 505, Dart or Cuda, auto or stick. I don't see why the "replacement head" should be a HP gain? I don't see where they define what the "replacement head" is?

Floyd Lippencott IV