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
1930-31 836275 All
1932 836718 All
1933 836961 CA Master
1933 600569 CC Standard
1934 837230 DA Master
1934 473740 DC Standard
1935-36: Thanks to Mike Boteler for this information:
All 1935 models used the  # 837230 (15 long bolts) Head until serial numbers;  # 4783317 (Master), M4862180 (Standard) and T4860723 (Truck).  This information was found in S-M Bulletin # 28 dated 4-4-1935. 
The new 1935 head  # 837682 (8 long and 7 short bolts) was also used on ALL models, not just the Standard. 
The 1936 motors ALL had the  # 837981 (8 long and 7 short bolts), this head changed the compression ratio from 5.4:1 in 1935 to 6:1.  This Head became the replacement Head for the 1935 motors.
1937 early 838355 All
1937-40 838773 All
1941-48 839401 All 216 and 235
1949 3835409 All 216 and 235
1950-53 3835517 All 216
1950-52 3835499 216
1950-52 3835909 235
1953 3701887 235
1954-55 3835913 235
1954 3635499 261 Truck
1955 3708570 216 Truck
1956 3836848 235
1953 Corvette 6 Cylinder
1954-55 3836241 Corvette 6 Cylinder
1955 3703523 Passenger, Corvette V-8 265
1956 3725306
1956 3837064 Passenger, Corvette, V-8 265
1957 3731554 Passenger, Truck V-8 283
1957 3731539 Pas w/4BC V-8 283
1947 3740997
 

CYLINDER BLOCKS

1924 327773
1927 348709
1928 348532
1929-30 835501 All
1931 836409 All
1932 836573 All
1933-34 837231 CA, DA, Master & Truck
1933 473180 CC Standard
1933 836915 CB Master Commercial
1934 473741 DC Standard
1935 837591 All
1936 836010 All and became replacement Block for 1935 motors Thanks to Mike Boteler for this information:
1937-38 838710 All
1939 838941 All
1940 839132 All
1941 839400 216 Passenger & Truck
1942-47 839770
1942-47 839910 216 Passenger, Truck
1942-47 3835335
1942-47 839751 235 Truck
1948-49 3835497 216 Passenger, Truck
1048-49 3835309 235 Truck
1950-51 3692703 235 Passenger Powerglide
1950-51 3835497 216 Passenger, Truck
1950-51 3692713 235 Truck
1952 3835692 235 Passenger with Powerglide, Truck
1952-53 3835849 216 Passenger, Truck
1953 3701946 235 Except Powerglide
1953 3701481 235 Powerglide
1954 3701481
1954 3835911 235 Powerglide
1954 3701481 235 Excluding Powerglide
1954-55 3702436
1954-55 3703414 261 Truck
1955 3835911
1955 3733949 235 Excluding Powerglide
1955 3836233 235 with Powerglide
1955-56 3836340 261 Truck
1953-55 3835911 235 Corvette 6-cylinder
1955 3703524 265 V-8 Passenger, Corvette
1956 3720991 265 V-8 Corvette
1957 3731548 283 V-8 with 2 BBL carburettor
1957 3867802 283 V-8 Fuel Injection