the factory assembly manuals for any series weren't redone every year of the series, they did one for the beginning [like 47 2nd series] and put out 'change bulletins' for differences the following years, sometimes supplements, and the 54 was likely that, because of major changes .... someone got hold of a good 54 assembly manual and reprinted it [with permission from GM] ... if you could find the change sheets for 52, or any other AD year, you could pay the piper and start selling reprints too
note that the shop manuals have mostly the same info and pictures from the beginning to the end of any series - the 55-59 assembly manual has a date on every page, nearly all 1954 [when they started building them] and a few 1955, and the only grille shown is the 55/6 .... what are the dates on the 47-54 assembly manual? 1953, when the 54 was started?
Bill
