Thanks for the help!

[ROCKY LEAR <rockylear@xxxxxxxxxxxxx>]

Thanks for all the input on the MV interchange info all those who participated!

After thinking about all of this....I think for the time being I will go the 392 route. Is there an online info about performance mods to the 392 like overbore tolerances and such? How does the 392 differ from the 345 internally? Are 345 and 392 heads the same?


I was talking to a guy here locally who ran IH pulling trucks a few years ago. He claims that there was more than one version of the 392. He says that there was a 392 made for heavy tandem trucks that had improved cooling. Can this be confirmed? I have always ID'd the 392 by the coolant tubes running back into the block instead of the head like a 345 does. Perhaps there were some early 392's that had the tubes going back to the head and later years had them going into the block...hence his comment about improved cooling.

If I do go with the 392, will the 4 spd. with OD (OD 5th) that I have be heavy built enough for the 4x4 3/4 ton truck? Could heavier pickups and one tons be had with the OD back then?

Rocky