cast iron heads vs. 317 aluminum heads

[Timmer1]

Hey,

I was thinking about swapping my cast iron heads on my 6.0 for the 317 aluminum heads. Would any year 317's be a direct bolt on? What's the difference between the two? Is there any reason other than weight reduction to swap to 317's? Does anybody have any specs on these? I saw it on here once before, but I can't find it now. How much of a weight difference would it be? Thanks for your help. Tim.

[skeet]

i got a set if interested