I used a 78 3/4 ton 4x4's power brake master cylinder on my 70 K5. IIRC a couple of the bolt holes were not correct. I also had to modify the rod that attaches to the pedal - the 78's rod was a little too short to work correctly.
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1970 Blazer with a 400 sbc and 4" lift
1980 Pontiac Trans Am, 455 Oldsmobile
2012 Kawasaki Concours 14
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