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i emailed cummins technical here in uk and asked if they could say if my 1984nhc250 eng number 11238813 had oil cooler nozzles for piston skirts fitted= they replied 250 of that date has?.perhaps earlier ones didnt or perhaps they got it wrong. Is taking the sump off the only the only way to...

?are the cyl heads on a mid 70,s 250 cummins interchangeable?coz my 250 is dated nov 84 and they are not so=the casting shapes are different,also it appears to have the later 3 hole coolant outlet in block and after reading the previous post web link this seems to point to my block having the...