A buddy of mine ran his Chevelle on a chassis dyno when he bought a RM 522, the same one I have now. It dyno'd a 839hp corrected from RM. On the chassis dyno, with 4.88's, pg, and 14x32's, the best was 620hp corrected at the wheels. I'm sure, as with engine dyno's, those number can vary a bunch depending on the operator.....we were both a little disappointed...... until we went to the track!
Johnny