Must drill and tap oil galleries under cam bearing. Sold as a kit. Oil Restrictor Kit. Small Block and Big Block Chevy engines, .060" orifice diameter. Oil delivery holes at rear cam bearing must be tapped to install. Includes 2 per kit.
- Reduces oil flow to upper engine assembly, leaving more oil available for the rod and main bearings
- Reduces power-robbing windage by reducing the volume of oil passing by the rotating assembly on its return to the pan
- Do not use with hydraulic lifters
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