Jurisd 10 Report post Posted April 9, 2011 Hi all. I pulled my valve covers today and found the casting numbers on the heads, but cannot find them referenced on decode sites. Can anyone tell me about the following? DIA E-AIO (last digit could be "O" or zero or even possibly "C"). But I haven't found any of those, so far. Quote Share this post Link to post Share on other sites
LoneWolf2U 136 Report post Posted April 9, 2011 Casting #'s are on the underside of the head. You need to remove the intake and use a mirror if the heads are still installed. Quote Share this post Link to post Share on other sites
