Q: What is an oil restrictor?
A: An oil restrictor installs in the oil passages of the engine block. It limits the flow of oil to certain parts of the engine.
Why would you want that?
Engine oil lubricates and cools vital engine components. In most cases, more oil usually means the engine will run cooler and last longer.
However, in some specific race applications, more oil can actually reduce the performance of the engine.
When roller rockers and solid lifters are installed, the amount of oil required by the valvetrain is reduced greatly.
Installing an oil restrictor kit will limit the oil flow, reducing the windage created from excess oil draining past the rotating assembly. This keeps the oil flowing where it is needed most — to the rod and main bearings.
Important Note: Oil restrictors are NOT recommended for any street vehicles.