So help me verify if this is just a replacement engine in my 37 GC. The block casting appears to be a 39 number if my book is correct, but the K prefix on the serial number would be a 37 number? Maybe stamped to match the old numbers? They look like they are carelessly hand stamped or is this common from the factory?
I think you are right; the old engine numbers were stamp onto a replacement block. Check the casting date.
Cast. No. 838101 for 1937, 838710 for 1938 & 838941 for 1939. The last casting number for that block. Removed 1/1/56. 1955 Hollander