[YENKO DEUCE REGISTRY]

Nice pics Sam! The 'CTB' in yellow on the side(s) of the block is consistent with other original engines, as is the white 'X's on the ends of the heads. The extra yellow writing is also consistent with others, although each engine seems to have different writing - my engine has a yellow 'JH' for example, written in paint with a long horizontal run down the side of the oil pan. The casting date of the engine is fairly early compared to others, as many were cast on the 18th then assembled on the 20th.

Cool slapper bars!