[Rory McNeil]

Steve, i can`t speak for the MoPar guys, but every production Ford FE (332,352 thur the 427 & 428`s), came from the factory with iron rocker arms. There was never a stamped steel rocker arm made for the FE Ford. There were 2 different versions of the FE iron rocker arms, the hyd. lifter engines had non adjustable rocker arms, the solid lifter versions had adjusting screws. The non adj. rockers were rated at 1.73 ratio, the adjustables were rated at 1.76, but like most factory rocker arms,advertised vs real world ratios don`t usually jive. The adjustable rockers I checked were normally under 1.73.
The same situation with the SB Ford stamped steel rockers, my 5.0 Mustang rockers normally test at 1.53-1.54, Fords spec is 1.60. I would imagine that the GM and MoPar OE rockers normally don`t compare favorably with the factory specs either.