Had this problem with the 265 in my '56 sedan, pulled all the freeze plugs I could get to and flushed with water hose and dug with coat hangers. This produced about a one pound coffee can of krap from the water jackets. Best of luck


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed