• Small Block & Big Block Chevy engines
• .0625" orifice diameter
• Screws into existing lifter gallery cleaning plug holes at back of block
• Reduces oil flow to upper engine assembly, leaving more oil available for rod & main bearings
• Reduces power-robbing windage by reducing volume of oil passing by rotating assembly on return to pan
• Do not use with hydraulic lifters
• Sold 2/Package