CWC is evident on most early Chrysler products. The CWC foundry in Roosevelt Park, Michigan, was the Campbell, Wyant & Cannon Foundry Co., founded in 1908.
This is the casting information on a 1953 Industrial 331. This is the top of the extended bellhousing. The date code, F123, indicates this block was cast on June 12, 1953.
This is the stamped ‘use code’ on this 331 Industrial engine, IND-20
And, of course, there is always something to be found that does not fit the ‘usual’ parameters. This is the use code found on a 51-53 331 TRUCK block:
This is the stamped ‘use code’ on a NE57; New Yorker 1957
The code is stamped on the top of the block, in front of the valley cover.
This is the back of a 1957 Chrysler 392
This is the top and valley of the 1957 392
The date code indicates that this block was cast on January 23, 1957.
There is considerable amounts of conversation with regards to the integrity or general strength of blocks with the ‘HH’ cast marks.
In the 30+ years we have been in business we have found no evidence to indicate that any one casting is better than another.