So, HASport says a K24 with axles, manifolds, accessories and transmission weighs 413lbs. Subtract the transmission, axles and p/s pump weight from the listed K motor weight and you're looking at an easy 100 pound reduction up front of the 86 compared to the FA20. Maybe more depending on manifolds used, etc. That's almost more appealing than the power bump.
http://www.superstreetonline.com/how...train-weights/