Big Cam 400 in 81' Peterbilt. Motor seems doggly and underpowered compared to others I have driven. I am considering having the overhead run, and turning up the pump. Any other ideas? How much can I turn it up without heat issues? Thanks. -

Welcome to the site. I moved your thread here so you could get the best answers from the right set of experts. Good luck to ya on this. -

Uncle Bubba's Sig:

99 Quad Cab, 4wd, Drag Comp W/Pump Wire & Boost Elbow installed, K&N Air Canon, MBRP exhaust, Belt Drive Lift Pump and bottom Bulkhead feed from the tank, Isspro EV Pyrometer, Boost Gauge, Fuel Pressure Gauge, DT Pro Fab Trac Bar, South Bend 13-1.25 Con O Clutch, Ranch Hand Bumper, Borgeson Steering Shaft, Black Silicone Boots, 2" Lift Soft Ride Front Coils, Solenoid High Idle Kit, Bilstein 5100 HD Shocks, Rickson 19.5 Wheels w/Hancoock Rubber, HD Maxx Link Sway Bar Links, Superlift dual front stabilizer, EGR Brakes Front and Back, RV275 Injector's, Blue Chip VP44, Prodigy brake controller, B&W Gooseneck hitch and more I can't remember right now. Not to mention more to come I'm sure.
374.2/846.7 at 30psi

Thanks. -

search low buck diesel power i have done big cam 400 this way .dont go to far you will melt pistons!! good luck -

Crank it up until she throws rods out the side or melts pistons, get a new engine , and back it down a knotch or two next time -

I drove an Autocar with a 400 Big Cam for about a month. That was a pullin son of a gun, probably one of the hardest pullin I ever drove. Get the overhead done and see how it goes. I hated that truck but loved that engine -

jasonfriedlin's Sig:

Do the overhead, and put in a couple numbers smaller fuel button. Dont just jump to a super small number. Pull yours out, then a Cummins shop should have the right ones. There's plenty available online too. -

nevrenufhp's Sig:

http://www.freewebs.com/nevrenufhp/index.htmDiesel fuel rate site of mine.
67 F100, 300, Edelbrock 4V, heddder, 4 spd, soon to be 4BT.
work trux: 94 IH 4900, DT466-P-pump, #0 plate, 2 clicks on gov springs, and a bit of timing(the one on youtube).
06 IH 7400, 300hp DT466E, no BOMBS yet, but it does ok.

Diesel Injection - Where the Strong Ones Come From go to "bruce's horsepower and torque articles" There is much more then A LOT of reading, but take the time to read it all.

Go here FIRST. You really have to read it all, there are little tips and tricks that if you start to just skim it, you will miss them. -

Cowboy_Customs's Sig:

'95 Dodge 3500 SLT Laramie NV4500 4.10LS Chevy cyl's flatbed Pacbrake 60# springs timed and tweeked Bilstein HD's 19.5's Lukes link 309K on the ticker
http://community.webshots.com/user/Cowboy_Customs

i will tell you now your fuel lines are shot. get big lines and a bigger filter head. order bruces duel fuel line kit and turn the pump up. easy 75 to 100 hp. if thats not good for you get a retarded cam key, put more fuel to it. keep a eye on the EGTs if you got some money i can make that truck breath fire. i pulled a 7 axle 144,000 permit lowboy with a bigcam formula 444 for years. (in the fast lane) -

FOR SALE CUMMINS BIG CAM REBUILT WITH NEW PARTS FROM PITTSBURG POWER CAM HEAD CERAMIC PISTON BEARING FUEL PUMP OVER $ 12000.00 SPENT AROUND 700 HP NEVER RAN SINCE REBUILT -

Overhead is a great place to start, then comes the button...................... -

00' Quad Cab's Sig:

Jason Hayes, Aberdeen WA

2000 Quad Cab 4x4 LB CTD Auto

you all hit the things right on the nose great job guy -

hotcummins's Sig:

12v 5x18s injectors 191 delivery valves 3k springs aroura5000 single i built the all billet tranny and ats 5 disc converter #100 fuel plate fire ringed arp head studs timing 22.0 degrees tabbed kdp quick spool cam and exhaust manifold 5 inch turbo back exhaust w/ 6 inch tip afe intake k&n cold air water meth injection airdog2 165








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