6.2 C vs. J interchangeability help please

[chevymanrob]

my 84 parts truck has a C 6.2. there is a local gentleman looking for a core/spare engine for his truck, but he has a J engine. from what i could find on the net the EGR and emissions stuff is the main difference. other than swapping the intake manifold to his J spec engine what else would be needed to make it work? i am diesel illiterate!!! any input or help is greatly appreciated.

[Edahall]

my 84 parts truck has a C 6.2. there is a local gentleman looking for a core/spare engine for his truck, but he has a J engine. from what i could find on the net the EGR and emissions stuff is the main difference. other than swapping the intake manifold to his J spec engine what else would be needed to make it work? i am diesel illiterate!!! any input or help is greatly appreciated.

You're correct, the intake manifold is the main difference.  He actually doesn't have to swap anything to make it work but swapping to the J code intake manifold is a good thing.  The only other difference is the the J code engine heads have larger valves which meant they were more prone to crack between the valve seats.