Tech Q & A Blocked In By Richard Ehrenberg Last updated Apr 10, 2023 0 Share I am dealing with a 318 block. At the end of the casting number is “11”. Does this indicate a January 1971 casting?No, that’s the sand core box number. For our uses, it is meaningless. 0 0 vote Article Rating 0 Share FacebookTwitterGoogle+ReddItPinterestEmailLinkedin