im a newbie to this site, so i hope you guys can help me out. im trying to find out what type of heads are on my car. its stamped J/R next to springs and J6 on the front. also its cast iron and weights about 550 pounds each. j/k any help guys is greatly appreciated, thanks. one more thing cooked up an awesome corned beef brisket tonight. woohoo!

 

pics or die

 

who knows what you got, casting numbers are on the underside of the intake runners