Installation Instructions for 555-23630 Adjustable Vacuum Relief Valve

The JEG'S vacuum relief valve allows calibration without removal to attain your desired crankcase vacuum level for optimal performance from auxiliary vacuum pumps or header E-Vac systems. Easily installs on valve cover or intake manifold valley area.

1 Locate the appropriate mounting location. Always consider the rocker arm, stud girdle and adjusting nut locations for valve cover placement

2 For valve cover placement, drill a 9/16” (.5625) diameter hole in the valve cover.

2a Remove lock nut from bottom of valve and apply thread locker to threads.

2b Insert valve into valve cover and tighten lock nut with a 7/8” (8AN) aluminum fitting wrench. Proceed to step 4.

3 For intake manifold placement, remove the intake manifold from the engine. Drill a 33/64” (.5156)” diameter hole and tap to 9/16”-18. Remove all debris.

3a Remove lock nut from bottom of valve and apply thread locker to threads.

3b Thread valve into manifold and tighten (using the hex portion on the body of the valve) with a 7/8” (8AN) aluminum fitting wrench.

4 Adjustment of the valve is achieved by turning the top of the valve CW (clockwise) to increase engine vacuum or by turning the top of the valve CCW (counter clockwise) to decrease engine vacuum.

5 Once the proper vacuum is achieved tighten the lock nut at the top of the valve with a 7/8” (8AN) aluminum fitting wrench.

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