Cylinder Head Porting, Antique and Hi-Performance American Motorcycles

POWER PORT on EVOLUTION  This porting job provides the airflow necessary to support up to 100 rear wheel horsepower on an 80”.  Includes installation of oversize hi flow 1.900” intake valves (stock is 1.843) and 1.625 exhaust valves ,as well as state of the art .600 lift beehive valve springs.  Full porting with intake runners finished to 50 grit and exhaust runners to 120 grit.  Combustion chambers are fully polished.  Intakes get a 5 angle seat for good wet flow characteristics, and a radius exhaust seat for maximum scavenging. Includes blueprinting of intake port opening.  $849

TORQUE PORT on EVOLUTION Maximizes intake flow while keeping the cost down by using stock exhaust valves. Includes installation of oversize hi flow 1.900” intake valves and new state of the art .600 lift beehive valve springs. Full porting with intake runners finished to 50 grit and exhaust runners to 120 grit.  Combustion chambers remain untouched with the exception of unshrouding of the valves.  Intakes get a 5 angle seat for good wet flow characteristics, and a radius exhaust seat for maximum scavenging. Includes blueprinting of intake port opening.  $749

FREE AIR VALVE JOB on EVOLUTION Complete hi performance valve job using your stock exhaust valve and an oversize (1.900") intake valve. Intakes get a 5 angle seat for good wet flow characteristics, and a radius exhaust seat for maximum scavenging. Choke opened to proper diameter for valve size. Includes blending intake seat into port and blueprinting of intake port opening. Intake valves included in price; extra charge for any other parts found in need of replacement.  $399