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Mark:
#3815857 casting number head, Chevrolet part number #3815856, was used on 1959-61 348 truck engines. Probably used on irrigation motors (See CPG!!!! I'm still at it!!!) as well as fire trucks and New Holland field cutters.
A long time ago, I was going to buy a New Holland field cutter and restore it. The mid 60's came with 409s. I also wanted to take it to Indy Super Chevy and win "MOST UNUSUAL"!!! Then I quit drinking!!!!!