• Hydraulic flat tappet lifters, Set of 16
• Chevy big/small block
• Maximum increases in low-end torque, engine vacuum, & improved idle quality
• Typical vacuum increases range between 3-5" at idle when used with bigger cams
• Lifters are fully adjustable & require an adjustable valve train
• Use a feeler gauge to adjust the amount of lift reduction, from .010" to .030"
• Duration is reduced between 5 & 20° at .050" lift, depending on the adjustment
• Complete lift & duration restoration take place at approximately 4,000 rpm