DescriptionInstallation InstructionsClick HerePiston Bore Size77.00mmTypeIntake / ExhaustRetainer MaterialTitaniumIntake Valve Lift0.395″Intake Installed Height1.150″Intake Seat Pressure55#Intake Open Pressure151#Intake @ Lift0.395″Exhaust Valve Lift0.370″Exhaust Installed Height1.100″Exhaust Seat Pressure46#Exhaust Open Pressure119#Exhaust @ Lift0.370″Valve TypeIntake / ExhaustValve MaterialBlack Diamond™ StainlessCoatingBlack NitronegIntake Head Diameter31.00mm / 1.220″Intake Stem Diameter0.1962″Intake Tulip18ºIntake Overall Length3.265″Exhaust Head Diameter25.00mm / 0.984″Exhaust Stem Diameter0.1760″Exhaust Tulip30ºExhaust Overall Length3.240″RemarksStandard if you have any Questions regarding this product please E-Mail [email protected]