Quote:
Originally Posted by Gregski
I was able to stick a pen cap [Science] in that hole 1 1/2" deep would that make it the deep hole?
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Yes that looks like a deep pushrod hole so it is for manual brakes. On our trucks the bore diameter is 1-1/8" for both manual and power brakes. Keith Seymore shared the engineering charts with us on what I think is the definitive thread about manual brake master cylinders for 71-72.
This is the same thread where 54blackhornet discussed his research at NAPA going into paper parts books to figure out the correct master cylinder.
http://67-72chevytrucks.com/vboard/s...30#post8909230