Dodge conrod bolts.

[motto]

Hi Lynn
From what I can make of the information available to me the M37 engine (T-245) could come with one of two connecting rod configurations depending on early or late production.
Early would be the same as the WW2 engine with three rods of one type and three of another and single tappet oil holes
The later engines seem to have all six rods interchangeable with two oil holes so as they can go in any position. Assumedly, these are the rods with the heavier bolts.
Some of what I say is from inferences in the data. i.e. Reading between the lines and has yet to be confirmed.

David