[86 GMG]

they came out on z28's like see ten said as far a benefit i believe they are barelly taller deck then cast but in not sure and then the basic aluminum light weight and less heat. you can really make some money with them if you know anyone that runs street stock dirt track they like to use trhem b/c they look and (are) factory i have two of them in my garage that a guy gave me when he needed his garage cleaned out so he could move ( i cleaned it out and came home with alot of goodies)