7" Single Diaphragm Power Brake Booster Zinc Fits GM Chevy Ford Street Rod

--Universal style brand new 7" Zinc Single brake booster. --Ideal for most small to mid size street rods and customs. --The booster mounts with a 4-bolt pattern,4 bolts are in a perfect square and are 3 3/8" apart (center to center). --Requires 18" of vacuum to operate properly, with this vacuum level the booster will produce a maximum pressure output of 950 psi with a 1" bore master cylinder. --This pressure level works well for four wheel drum systems and disc/drum vehicles which are relatively light. --We highly recommend you purchase the booster and the master cylinder from our store together, which will perfectly compatible with each other. If you already have a deep pushrod master cylinder and you purchase our short push rod booster alone, you might need a pushrod spacer for installation. --Including all items in the picture. Note: Professional installation is strongly required.No installation instruction is attached in the package.