They don't much sell reman master cyls. for the older trucks but often new ones are available. Napa part # on that one is 9220. It is 1 1/4 in. The kit is part #33. I tear em down & hone the cyl. If it doesn't have any pits in it you can rebuild it yourself. You can buy a hone at the Chinese tool store for under $10.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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