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Click on image for the lowdown. 
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | In 25 words or less?
216ci - 1937-1953
low pressure lubrication system
babbetted rod bearings
dipper/spray oiling to rod bearings
235ci - 1941-1952
low pressure lubrication system
babbetted rod bearings
dipper/spray oiling to rod bearings
1953 235 - complicated differences in this "transition" year
1954-1962/63
235ci (and 261ci)
high pressure internal lubrication system
insert rod bearings
internal oil feed through crankshaft to rod bearings
Many minor changes in these engines during their production years.
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