bolt pattern power brake booster

mopar440bbody

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Jul 28, 2016
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louisiana
hey i need to order a replacement booster i would like to make sure i get correct one. should the firewall bolt pattern be the same master cylinder. 3 3/8 x 3 3/8. i my can measure it from inside but its very thigh and awkward . i think i have a 7 inch dual booster from speedway motors . was on car when purchased. thanks
 

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