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1966 GM-A body Chevelle, Lemans GTO, Cutlass 442, Skylark GS, Dual Master Cylinder conversion with Master cylinder, Delco Power Brake Booster, brake lines and block. Standard 1" bore for power Front Drum brakes. Shallow hole. This is for all 1966 with drum brakes converting to dual master cylinder from the single master cylinder with power booster brakes.
This is the master cylinder used on all dual system conversions - it breaks the front and the rear up and separates the one system into two. It fits right in place of the old master and booster and bolts right up. It has the hard to find correct 1" bore for drum brake cars - the later 1 1/8" master will not work the pedal will be too hard to push in.