cummins ntc 350

Its all based on CPL. And who ordered it. You can do alot with the 350. Find a good pump shop in your area. The fuel line probably only goes to front or rear of head. Put a Y in it and plum to front and rear. Equal out fuel pressure and cylinder temps. Ported and polished exhaust manifold. As large a fuel line from tank to pump as you can get. But 350/400 the compression is different, cam and most likely injectors. But this set up will get little over 400 out of the 350 if ypu have a good pump guy.

 

If the truck is really cheap, pull the BC and put a 3406 in there. There's your 425 hp, and you'll hardly get greasy.

 

Blah blah blah 425 cat.

 

@SmokinCAT

 

I have one at home cpl 369 BC1 350. I put bigger injectors (can't remember the number) also had the fuel pump work on the bench , puts out over 300 psi and Holset HT4 . When all said and done, it ran pretty darn good and still average 6.5 mpg

 

So the 1,2,3, or 4 are design levels of the engine, higher the number newer the engine, there are multiple HP ratings within each BC1,2,3, or 4

Cpl number or control parts list determines what parts are in the engine, higher he HP usually means lower compression higher flow injectors and better turbo.

A 350 would have a .5 higher compression then most 400s with slightly less flow through the injector and less fuel pressure. Timing is also more advanced.

 

Ever get the chance and think about it.... We use to own a 855 with factory 425hp. Told the guy that owns it now I'm stopping some day and getting the serial number and cpl number off of it. As mentioned earlier, you can do a lot with a 350. But getting it cranked up to factory specs would include changing all 6 slugs, injectors, and changing the time on the cam. This is a 1987 Big cam 4 in a 95 model truck, lot of little tricks to get a few extra ponies out of it. Most are listed in the earlier responses. Making changes on these O'l things can be like the little old lady that pee'd in the ocean.... Ever little bit helps . Engine that was in this truck was a 1981 350 built to cpl 625 400hp at 2100rpm, with the air to air and a #15 button pushing through a 15613 trans into 3:70 gears. I spoke with the last man to drive it, he said grossing still 78,000 across I-70 through wheeling, WV was just a matter of splitting out of OD and go on across the grade. To give you more basic answers to your original question, the 350 is a fine motor. Keep us posted, good to see old iron coming out of the wood work.