I have a 1979 F250 460 C6 Dana 60 3.54 gears. When pulling my trailer (7,800 lbs.). The truck could use more power. What can be done to give more towing power. Thanks for you help.

 

The first thing I would do is put either 3:73 or 4:10 gears in it. Mileage won't suffer much because the motor won't be working as hard.

 

What RPM do you turn with E4OD tran with 3.73 or4.10

 

I don't run my '84 F250 Super Duty(8800lbs) Supercab with 460, C-6 with 4.10 gears over 55 mph much, as milege drops from 9.5 to 7 with a 250 rpm increase. The 460 sees about 2750 at 55mph. I suspect that the secondaries are creeping open with the additional rpms because of the mpg drop. Will soon recurse the dist. and respring the secondaries with next stronger spring.

 

Hey Bear,

What kinda build you got on your 460? I am not impressed with the power of my fuel injected 93 460 in a F350 4x4 and have been toying with the idea of either dropping a Cummins in it or rebuilding the 460 as a carbed engine with D0VE heads. I currently get about 10mpg and would prefer not to go under that. I have a ZF tranny with 4.10s.
DannyP

 

DannyP; I don't really have a build on my engine. I'm a believer in stock compressions, to use regular gas and then do all the things that help it run better. When I got the 460 it got 7 to 7.5 mpg at 55mph and 6 above that. The 2 1/4" head pipes dumped into a single 2 1/4" pipe and muffler and 2" tail pipe. Hell, the secondaries wouldn't even open it was so restricted. Turn 3800 rpm at WOT and that took awhile. Installed a 3" exhust pipe, muffler and tail pipe. Now motor gets 9 to 9.5 mpg at 55mph, the secondaries open just fine and at WOT turns 5500 with ease. As soon as my left arm works a little better(had surgery on it) I will recurve the dist. and install the next heavier secondary spring(I have a complete set from Holley left over from my racing days). The recurve entails pulling the cap and pickup plate and changing the advance curve from the 13 degree side to the 10 degree side. Lets you run about 6 more degrees of initial timing. Better bottom end and mpg. The heavier spring will slow down how soon the secondaries open as I think they are starting to open at about 60mph on the highway or whenever I have to throttle up for a hill. My old 390 with the exhaust, dist. recurve and carb rejet and secondary spring changes got 13mpg highway and 9.5mpg with camper and race boat in tow. If I get even 11mpg out of the 460 I'll be more than happy. If the 4180 carb gives me any grief, I have a Holley 4150 List #1850 600cfm sitting on my bench not slated for anything that I can replace it with.