That's a GM engine in your Workhorse, but could be either the 7.4L (454) or the 8.1L engine, dpending on the chassis year and model. Earlier P32 chassis had the 7.4L engine. In any case, the engine number is piut on by Gm when the engine is made, so should be in the same place for all similar engines. A GM dealer or mechanic ought to be able to tell you where to look on the engine block
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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