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Someone put an early 29 motor in my 30 and it still has the oil pan with the plate to give access to the oil pump. It was easy for me to figure it out as they scratched out most of the early number and stamped the 30 number below it. Could be some engine that they were using to test something with and just put it back in the assembly line at some point but most likely it has been replaced after the original cracked or started burning oil.