There are actually three versions. 6.2 C-code, 6.2 J-code, and 6.2 J-code commercial/military
C-code engine uses its own emmissions package, a heat-riser on the driver's side exhaust manifold, a special intake manifold with an EGR valve, the smallest precombustion chambers in the heads, and a detuned fuel injection pump.
J-code as found in 3/4 and 1 ton civilian trucks, vans, Suburbans, etc. Few emission devices, wide-open intake manifold, next step larger precombustion chambers in the heads, smaller valves in some HD models, and an injection pump with a higher delivery rate and a different part # delivery valve.
J-code commercial/military basically the same as civilian except for a few tweaks in the fuel injection pump and even larger precombustion chambers in the heads. Also, so have thin-fuel kits in the fuel injection pumps.
All the engines up to 1991 use the same blocks and cranks. When the 6.5 first came out, it used the same block as the 6.2, and both versions uses a new-type crank with a one-piece rear-main seal.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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