Oil Restrictors
Fits SBC BBC, .0625" orifice dia. Screws into existing lifter galley cleaning plug holes at the back of block.
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
1/4" NPT thread size
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