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PROPORTIONING VALVE ADJUSTMENT: THE PROPORTIONING VALVE IS USED TO ADJUST THE RATE OF INCREASE IN REAR BRAKE LINE PRESSURE
4 FRAME MOUNTING BRACKETS
THESE TAPPED HOLES ARE LOCATED IN THE CAST BOSSES
AND WILL WORK WITH BOTH AUTOMATIC & MANUAL TRANSMISSIONS
& ARE COMMONLY USED ON MICRO SPRINTS
HEADER,BBC,1 7/8",68-74 GM CAR,LONG TUBE,3 1/2",CHROME PLATED 28-48 Ford Chassis PROPORTIONING VALVE ADJUSTMENT: THE PROPORTIONINGBrand New Pair of Southwest Speed Triple Process Chrome Plated Long Tube Headers for 1968 1974 Big Block Chevy 396 502ci Engines (Part #440 2414). These Southwest Speed Long Tube Headers feature 1 7 8" primaries flowing into 3 1 2" collectors, with a pair of 3 1 2" to 2 1 2" reducers included for flexible exhaust routing. The S. A. P. port shape is designed to deliver more performance and better fuel mileage compared to stock manifolds. Each set comes
