I am looking for aprox 475-600+hp.
I have a 7FB 400hp AWAC, circa 1986. I also have a 8PN 425hp circa 1996.
I need to rebuild a 3406 B/C within the next few months as the "E" model I am using now just has to go!!
Either way, both motors need 6 new piston packs, 6 Injectors, Turbo.
The head from the 7FB is a square port head, this would be the better one of the heads to use of the two heads. I have thought this all along, and have read it in several posts on here. I have a matching square port manifold to go with the head.
Which of the cams would be the better one to use for a build? Are both cams just to limited? Where would the limit be for each? Ideas for a different cam? Cat only please, ballpark price as well.
Is the C/E crank really worth bothering with? I have one B model crank, and one C/E.
I know the 8pn pump would be the better pump to use as it has a pop of 2800psi as apposed to the 2500 of the 7fb pump. I would prefer to stay with the small dish pistons like what is used in the 8pn.
When I ran the 8pn, the engine was completely stock, including timing. I really liked how smooth and quiet it was. Nothing like the 7fb which was always rank sounding, which either way is better than the “E”.
I haul a walking floor, 6 axles at 100,000 everyday. I currently am holding 4.6mpg running a moderately harsh run (with a 355 "E" model with a power harness and a pinched wastegate hose). On a scale of 1-10, I would say it is a solid 7-8 simply because of how hilly it is and how much speed-up/slow down due to small towns. The rest of the run is smooth and 55mph zone. The others that run the same route and I all judge a truck by one hill in particular. A 45mph run is all you can get for it, and right now I pull 32 mph at the top with a rto 13 speed, and 3.55 with 24.5 tall rubber. A 2010 KW with a 500 isx/18 speed/4.33/24.5 tall rubber pulls this hill at 44 mph.
In the very least I want to hold the 4.5 mpg, with little smoke, only a slight haze to a slight puff of smoke from the shifts. Long trails of moderate to black smoke are nice, but draw to much attention.
Other things of thought.
Oil pump/pressure relief valve upgrade?
Any and all help is greatly appreciated!!