The cam timing was advanced with an offset key in the cam drive.
It got the pulse manifold and a holset turbo set up by an engineer at Cummins. Again, I did not do the fuel work on it.When the time came it got an air clutch fan controlled by a temperature sensor. It was getting lots of fuel when I got it. It might have done more but it would get hot pretty quick. A good 400 will pull 80,000 up it about 22- 23 mph. We have a local grade that is close to a mile long. At the time I owned it the pulse manifold and holset turbo were unheard of.Īs far as horse power I always figured 600 or so as I said earlier. Turbo said vt 50 on it but doubt they were original vanes. I do know if you put a load on it under 1800 rpm you were probably going to put in at least one head gasket. I put a viscous drive fan clutch on along with a plastic blade for lighter weight. I also adjusted the boxes on the side of the block to get a little more advance. Fuel pressure was raised but I am not sure how much. I do know the governor was removed, it had the offset key to advance the timing. I wasn't the one who set it up so I do not remember all the things. My small cam went down the road years ago. This truck with the 350 will just be for fun as it's an old collectors truck. Yeah I hear ya! We have a M11 set 400 hp, an ISM set 400 hp, and a N14 set 525hp.I'd rather run the N14 any day of the week even tho it's in our oldest truck! Lol Just don't want to pull onto the road and get run over by all the big boys!
I'm not looking for crazy power out this 350.Ĥ00 hp would satisfy me.this truck would just be a toy anyway but might occasionally run a load or two in hopper bottom to river terminals or elevators with it just for fun! By no means will it be a daily driver hence why I don't want to throw a ton of money into engine! IADAVE, With your fuel pressure, turbo and manifold upgrades where would you estimate your horsepower is running at now? Could you explain what all you did to yours?ĭo you just run it manually or yours factory installed?
I wonder what those specs where? Edited by IADAVE 11:03 Just another thought, at one time Cummins came out with the magnum engine to use up the small cam blocks. Efficiency gains help productivity, longevity and economy. Remember, this engine is over 45 years old. It has been a while but If memory serves me you may gain almost 1 mpg also.Īn air operated one is more efficient but a viscous drive will help and is an easier install. If you do not have one a fan clutch will give you another 25-30 hp easy. Probably could get 2000 hp for 30 seconds or so with enough money ! LOL On the other hand if you have the cash to play and want a toy all kinds of things are possible. Lots of parts interchange and make power in different ways. Lots of parts around so they are not expensive. An old Cummins is a lot like a 350 chevy. The main thing is finding some one who knows the stuff. Then if you end up needing a turbo or manifold,upgrade then. Probably could go up towards 300 with out much risk. It wouldn't cost much to bump the fuel pressure. The reality is if you are looking to just get more done the cheapest thing is to keep the left hand door shut. Is that a low flow radiator setup? If So those will just about overheat in stock form. The 350 doesn't get many miles on it anymore nobody wants to drive it after driving the 500. 48 psi of manifold boost and it burns less fuel than the 350. The 500 has a tremendous amount of torque. Have a 350 cummins in one truck and a 500+ red top cummins in another. What you going to spend on this engine is going to be more than just buying a big cam engine. I think there should be a timing adjustment too.