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differences in 4020 diesel manifolds

kitt why are some manifolds on diesels mid block and some hi block like 4320 s did john deere make this change in later 4020 tractors
kitt I posted the question and did more research which was Dons tractor parts John Deere used a different block in 1971 and 1972 4020s for air conditioning the new blocks used the high rise manifold and possibly a couple more horsepower. Dons tractor parts are very knowledgeable on 4020s


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