[DAVID GAGNARD]

Main difference is with aluminum heads you can run more compression in your motor and usually depending on the head itself,usually port/polish aluminum heads out more to flow better than iron heads,usually,depending on the head itself.......With that said,at the 40th Mustang bash in Nashville,I noticed the top cars in the Vintage class were mostly running Roush iron heads,these are "race only" motors and most if not all were strokers,mostly 347's......

I prefer aluminum heads for the compression/light weight and they generally flow better than iron heads out of the box (depends on head manufacter again),also can be repaired if damaged and right now they are not that much more than iron heads in cost.......

All depends on your budget and what you plan to do with the car,if is a street car,iron heads will be just find,if you plan to do any racing, I would look into aluminum heads........

Just my .02 cents and I am by no means an expert on heads,just my opinion.............

David