I don't know for a fact but I believe the current Pistons are forged. is there any performance benefits to running 273 adjustable rocker arms. I happen to have them but not sure if the extra weight would be detrimental.
if you are running non adjustable rockers..the 273 adjustable will allow you to set the correct pre load on the hydraulic lifters ....plus they are probably closer to the 1.5 ratio then the non adjustable...