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I read an article years ago that stated the pre combustion chamber cups were designed in the military heads to allow them to run a broader range of fuels.I have a 1028,and 1031. Both engines are extremely loud compared to civilian. Just installed a civvy pump and injectors on a friend's 1028...

I was referring more to the injection event noise.Civilian motors are so much quieter. My understanding is that the pre combustion chamber slot size determines how fast the combustion event takes place.these old mechanical pumps just push the fuel out in a big shot pretty much,and the size of...

Yes, I have that silencer system on a civilian truck. But I have to pull to exhaust manifold bolts for the support bracket. I've been a little leery to pull them because everything sealed up well.

6.2's differences I have owned many 6.2 and 6.5 engines over the years. And have had good luck out of all of them. Why are these military motor so much louder than the civilian versions? I just helped a friend install a civilian pump and injectors in a 1028. It's still sounds like..a cucv...