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No, never worked on one, Just a bumpkin behind a keyboard. I just read alot

Sorry, i'll play nice. Done.

Modern diesel engine DO put unburnt fuel directly into the exhaust, be it into the pipe just past the outlet of the turbo via separate injector or via 5th injection (dosing) cycle when the exhaust valve is open and evacuating the cylinder of the burnt gasses, That is how the catalyst starts the...

This is the switch you circled...

^^THIS is correct. There is a fueling mode called throttle leakage on the mechanical pumps and "motoring fuel" on electronic engines, Cummins anyway, other manufacturers have different terminology, but it is same same. It is there for a few reasons, one, if there is no fuel circulating...

Ever seen compression brakes and how they work? Not simple by any means, it all needs to be timed or massive engine damage will result.

Looks like the spring is on the wrong side of the butterfly. Look at the flow arrow and look at the bevel of the butterfly.

ISC 8.3L, roller followers in 2003-4. before that, flat slider tappets, ISL 8.9L introduced in 1998, looked the same as the CAPS ISC but stroked 10mm and had roller followers, ISM is 11L and has always been a roller follower engine and is not in the same class as the C and L. C has always been a...

Negatory, the tappets are flat sliders. They went to rollers 2004 ish on the C and 1998 for the L. Still, even with some type of "conditioner" in the oil, I would be concerned about valve train components holding up to added pressure of a taller, heavier wound spring that wasn't made for this...

Gimp, It will be fine mounted there, OP, The rockers, IIRC, are just stamped steel and the cam is old school cast iron. I would run it like it is now. The truck is 14k, it isn't heavy. I feel the 60 lb Cummins springs will be too much for the valvetrain on the LDT