Chevy Water Neck Outlet Restrictor Kit - 63440

The PRP Chevy Water Neck Outlet Restrictor Kit (Part #63440) gives racers a simple way to fine-tune coolant flow leaving the engine, helping control how much heat the coolant absorbs as it circulates. The kit includes three restrictor plates -- 5/8", 3/4", and 1" hole sizes -- each with a 2-1/8" outer diameter to fit standard Chevy water neck outlets.

By swapping in different restrictor plates, teams can tune cooling system performance to match track conditions, engine combination, and cooling demands. It's an inexpensive, easy-to-install kit for dialing in engine temperature management on Chevy-based racing and performance engines.