Engine Casting Numbers

Still trying to figure out the engine block numbers - a lot of references out there and just trying to make sure I get the right information.  So far this is what I have 

To summarize the known casting numbers for Cylinder Heads are:

 # 327773 AUGUST 1921 TO NOVEMBER 1924 [U.S.] 

# 41522 1921 TO 1922 [Canadian] then 

# 327773 # 344128 DECEMBER 1924 TO MARCH 1926 

# 345453 MARCH 1926 TO JUNE 1927 

# 346886 JUNE 7TH TO NOVEMBER 1927 

# 348540 DECEMBER 1927 TO OCTOBER 1928 AND THEN FOR FURTHER CASTINGS IN LATER YEARS: # 348540 [e.g. 1931 cast for the Parts Department]

CHEVROLET CASTING NUMBERS

FOR IDENTIFYING THE YEAR AND APPLICATION, CYLINDER HEADS AND BLOCKS

CYLINDER HEADS

1917,18, 19 338048 D V-8
1922 381099 FB THREE-PORT
1916-21 333776
1922-27 345453 Single Port1 ½" Valves
1927 346886 Single Port AA, LM. 1 21/32" Valves
1928 348540 Two Port
1929 835503 All 1930-31 836273