Allstar Performance Aluminum Oil Restrictors are designed for use in Dart SHP blocks with a priority main oil system. These restrictors limit oil flow to the upper portion of the engine, reducing the risk of oil starvation in the crankcase during continuous high-rpm operation. The restrictors are crafted from aluminum and feature an Allen head design for easy installation. Each pair includes two restrictors, an additional O-ring, and comprehensive installation instructions.
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