Seller notes

This is a NORS (New Old Reproduction Stock) heater control valve for 1965 & 1966 Buick Riviera, Wildcat, and Electra 225 models with the 401 or 425 cubic inch Nailhead engine. This valve has been tested and it works. The 2nd picture with shows a red pen pointing to a groove in the heater control valve. This groove is just like the factory original valves. The newer aftermarket valves do not have this groove. The groove is important because that is how the valve is mounted in the original bracket...

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