turning up a b model cat motor changing afc diaphram

All the other components are the same.

 

That's some good fuel mileage on a stock motor! I never did any good when motor was in stock condition, lucky to get 5.5 mpg.

This motor should have an air to air cooler already on it....?

Do what Semi Crazy posted. Look for ynot or sledman, they should be able to tell you anything you need to know about that motor.

 

Log trucker you should check the timing using at least pin method.

AATAC does not make it a 425. Governor is the difference on a 7FB from what I can find. A 7FB is supposed to have the good stuff inside already.

Otherwise what would be the difference between a 350 JWAC and a 425 JWAC?

AATAC will give you cooler intake air and more power.

Put in [[some 0R-8785 nozzles]<<< correction DO NOT!!] and a 198123 Borg Warner turbo and time it at 21 BTDC.

 

If you add a CAC, bump the governor to 2100 and raise the fuel settings on the pump, you're in your HP range without upgrading the radiator or giving up reliability for little money.

 

I didn't see it anywhere, but what is the serial number? That plays into what and how much can be done.

An air to air is not required to get to 425, if yours is an early B model prolly all that sets it apart is the torque group in the pump and the turbo. I still have the jwac on mine and it is a far site over 425.

Also, do not put nozzles meant for a dual scroll pump in an engine with a single scroll pump on it, that's a quick way a wearing out a good pump.

 

Log Trucker you need to get that pyrometer fixed before doing anything. Semi Crazy is right start by pin timing (although I dought it being to far off with that good of fuel milage,and no smoke) theres a plug with a 9/16 head on the side of the injection pump, remove the plug (it is about 1/2" long with a O-ring) use a 3/8 pin or bolt and insert in hole, then look on either side of the flywheel housing and you will find either a plate with 2 bolts or a 3/8 hole, place another 3/8 pin or bolt in one of those holes. Get someone to help and hold pressure on the pins while turning the engine counter clockwise by hand, if both pins slide in the holes at the same time then your in time (TDC). If only one pins goes, if it's not the one in the pump then remove the pin from the flywheel and repeat the process til the pin will fall into the pump hole, then remove the witch hat on the drivers side front of engine, loosen the bolts, with pump pin locked in, turn engine counter clockwise again while holding pin in flywheel again, when it falls in you will be TDC. Tighten bolts back down in the timing advance and install the witch hat. This is also a good time to run overhead. When you get all this done turn the rack screws out 2 to 4 rounds, if you find a place that can meter time, then set it at 24* for a 7fb. I think YNOT has all this covered in the mod section of "the diesel garage" in the heavy duty section.

 

When timing a B or C pin to pin is as close to the specified timing as you can get without a meter.

To know for sure, the degrees that match the pump cam is scribed on the advance end of the camshaft.