. "-The second position must be a number, and there usually is a letter at the last position. a 406 example for 1962 would be PREFIX-C2AE; BASIC 6015; and SUFFIX-J. I do not believe the basic number was on the blocks (usually, anyway) so that you should be seeing C2AE-J. According to the Ford High Performance Parts Identifier (Winkelman), other suffixes are K and V, and later B and D. 1963 blocks may" . . .