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One of the many other benefits of adding aftermarket aluminum heads was the handling....the front feels much lighter, the truck doesn't feel as top heavy anymore and responds well to steering inputs...
It is also easier to steer at slow speeds believe it or not.
The other side effect benefit is the losing of overall weight.....the complete cast iron heads weigh about 70lbs for both....the aluminums weigh 42lbs if that....
doesn't seem like much but when you get that 28 lbs and put it in motion....it will really amplify the effects...