Blocks

Chrysler ________________________________
301-331-354 blocks have a main bearing bore diameter = 2.6565-2.6570", the thrust main width = 0.995"
392 blocks have a main bearing bore diameter = 2.8800-2.8805", the thrust main width = 0.995"

301 ..... 1955 ............ 1613129  'W' casting
331 ..... 1951-1953 ....... 1323329
331 ..... 1954 ............ 1330129  truck-marine-industrial
331 ..... 1954 ............ 1551629  pass car
331 ..... 1956 ............ 1618628  Spitfire (poly) 'W'
331 ..... 1956 ............ 1619629  VTxxx
354 ..... 1956 ............ 1619829  Pass car
354 ..... 1957-1958 ........1619829  Ind 56A
392 ..... 1957-1958 ....... 1673729 (High '-' number usually indicates 1958 usage.)

DeSoto_____________________
276-291 blocks have a main bearing bore diameter = 2.5675-2.5680", the thrust main width = 0.885"
330-341-345 blocks have a main bearing bore diameter = 2.6925-2.6930", the thrust main width = 0.885"

276 ..... 1952-1954 ....... 1327429
291 ..... 1955 ............ 1558929
325 ..... 1957 ............ 1739429  (KDS)
330 ..... 1956 ............ 1636629
341 ..... 1957 ............ 1636629, 1856629

Dodge____________________________
241-260-270 blocks have a main bearing bore diameter = 2.5675-2.5680", the thrust main width = 0.885"
315-325 blocks have a main bearing bore diameter = 2.6925-2.6930", the thrust main width = 0.885"

241 ..... 1953 ............ 1328829  D44
241 ..... 1954 ............ 1551229
270 ..... 1955 ............ 1632229
270 ..... 1956 ............ 1635729 truck
315 ..... 1956 ............ 1630029, 1730129 (D-500), 1730429(late)
315 ..... 1957 ............ 1739429  truck
325 ..... 1957 ............ 1739429  (KD500)(KDS)

Plymouth___________________________
260 ..... 1955 ............ 1632228, 1632229 (P-27)
270 ..... 1956 ............ 1632229 (P-29)