Marine Oil Restrictor Kit

All GM and Pro Merlin

For small and big block Chevy and Merlin III blocks. .0625" orifice diameter.
Screws into existing lifter galley cleaning plug holes at the back of block. Two per package.

Reduces oil flow to rocker arm assemblies, leaving more oil
available for the rods and main bearings.
Reduces power-robbing windage by decreasing the volume of oil passing by the rotating assembly on its return to the pan.
Do not use with hydraulic lifters.