Depends which cylinder we are talking about. I haven't weighed Zacks PHP cylinder but I have a billet ABLE cylinder that is a tank! It's not the billet that makes the power it's the bore size that they run, the powervalves, the large volume in the transfer and boost ports etc. With a billet cylinder you aren't limited to modifying the recreational cylinders from the factory to your riding style. A billet cylinder can be designed to any bore, stroke, port volume the manufacturer desires as long as it bolts to the cases it's designed to be run with.