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Located on the RHS head.. facing out to the intake manifold..this GM Discontinued part is critical in relieving pressure on the heater core by its valved internal water flow limiter built in.
Replace this rusted outlet during restoration and longer term maintainance to prevent a major tow home repair job....
One per engine. Fits 1964 -79 Pontiac Engines.
Not correct for 301 - 1977-81Pontiac block
WD's.. 5 set min