Hydraulic lifters compensate for changes occurring within the valve train. Crane Cams' precision made "Anti-Pump Up" lifters allow the engine to reach its maximum RPM potential (with the correct cam and components). The "bleed rate" of this lifter is maintained by micro tolerances that prevent pump-up and limiting of full RPM potential. After proper preload has been set, hydraulic lifters seldom need maintenance. Maximum RPM Potential: 6,500 to 7,000 RPM. "Anti-Pump Up" Performance Hydraulic Lifter Applications Crane Cams performance hydraulic lifters offer precise oil metering and control. Our exclusive check ball internal valving prevents hydraulic lifter "pump-up" with performance camshaft profiles, even at high RPM. Review products and applications. Anti-Pump Up Hydraulic Lifters 99277-12$63.60 Anti-Pump Up Hydraulic Lifters 99277-16$84.80 Anti-Pump Up Hydraulic Lifters 99278-12$69.00 Anti-Pump Up Hydraulic Lifters 99278-16$92.00 Anti-Pump Up Hydraulic Lifters 99280-12$66.60 Anti-Pump Up Hydraulic Lifters 99280-16$88.80 Anti-Pump Up Hydraulic Lifters 99281-12$66.60 Anti-Pump Up Hydraulic Lifters 99281-16$88.80 Anti-Pump Up Hydraulic Lifters 99282-16$86.40 Anti-Pump Up Hydraulic Lifters 99284-12$63.60 Anti-Pump Up Hydraulic Lifters 99284-16$84.80 Anti-Pump Up Hydraulic Lifters 99286-12$88.20