Spark Delay Valve System: Description

Valve is a one-way valve that incorporates two sintered metal discs which delay vacuum spark advance during acceleration.

NOTE: System will not operate properly if the valve is installed backwards. It is imperative that the BLACK side of the valve be connected to the vacuum line leading to the carburetor.

Also incorporated is a rubber check valve which is used to bleed vacuum from the distributor vacuum unit in order to permit immediate vacuum retard when decelerating.