Join Date: Aug 2005
Location: BC CANADA
Feedback Score: 0 reviews
Re: CAT 3406B
Most of the guys around here that used to have the hot 3406B setups have evolved into newer trucks with 550 E models. Trucks work for a living here, 140,000 lbs GVW and mountain roads. Truck engine population up here is 50% Cat, 50% everyone else combined.
3406B's have narrow rod brgs, aluminum pistons, weak timing advances, slow rate in the fuel pump.
Early 3406C's would be a better pick, wider rod brgs, available 2 piece pistons if you really want to modify, fast lift on the pump cam and timing advances that live for more than 2 years.
A superhot 3406B may be neat for a while, but how many pistons can you afford to burn till you get it set right? Even if you get it right the first time, a timing advance failure would cook it by the time you realized something was wrong. There seem to be lots of "experts" around willing to crank it up but are they around to help with their wallet open when you have a meltdown? See the first line of this post as to what others have done after doing what you propose to do.
I imagine you must have a 425 hp now. Rebuild your advance and have it set with the proper dynamic timing kit. Reseal the AFRC. Be sure your fuel pressure is 40 psi idling, should hover around 30 psi fully loaded. Have your barrels and bonnets lapped by a competant dealer if internal leakage is suspected. Check your AAAC and complete intake system for leakage. If more power is needed change rack setting, adjust the AFRC to keep the smoke opacity on acceleration down so you don't stick out, your running on roads full of electronic engines now. Don't forget about your rod bearings, they have a definite life on a B model. I wouldn't crank the power unless the cooling modification has been done on the head, so many things to do to a B model.
Truck is new to me 1997 F350 4x4 PSD, 192000K, regular cab, l/box, E40D, 3.55, BD 3" downpipe, BD transmission accumulator body, Tru Cool 4590, B&M remote transmission filter, autometer gauge set. AutoEnginuity 3.4 Scan tool.
This truck is to replace my 1987 F250 4x4 XLT Lariat, 6.9, C6, 3.55 311000K