The Stovebolt Site Forums The Parking Lot Big Bolts 1966, C60? Master cylinder

I would take it apart, hone it out, and see if one of the Napa rebuild kits will have the internal parts you need. The one with the neck, I am assuming it is Napa part # 34403, shows a 1 1/8" bore. Does yours have the same bore? Will the neck hurt anything, or will it still fit in the truck? The reason I am asking, it looks like Rock Auto shows the same one, yours may have been replaced t some point and not be the correct one.