[LT7A]

Gregski, do you feel like you've noticed any benefit with regards to the lighter weight of the aluminum over the cast iron other than lifting them over the fender? You said the performance feels about the same and, so maybe it's not enough weight change to feel a difference. The owner of the local high performance shop that does some of my work has cautioned me that aluminum heads actually pull energy out of the combustion event in the form of heat. He says that installing aluminum heads without increasing the compression ratio about a point will actually net a drop in performance. If that theory holds, then maybe you have increased flow etcetera, but then were balanced out by that factor.