I just knew you all were hanging out somewheres on the web ... I just picked up a new toy, '91 F350 XLT SC DRW 4.10LS ... with the 460 of course. Clean as a whistle with 87K original miles. Got it to tow with, as my 4.6L F150 4X4 (which I just LUV with no trailer btw) just isn't up to the task of dragging the sailboat from Oregon to La Paz and back this winter. This is my first big block, and my mechanical expertise is pretty much limited to bolt-on level stuff with Ford/Chevy small blocks and 3.6L Porsches. I've been perusing the archives a bit (and will do lots more) so I don't ask too many dumb questions, but I can't help but fire off a few here regarding ideas for this rig. Here goes:

1.) Where can I learn more about this rig? I am unfamiliar with the evolution of the 385 series induction systems, and would like to learn about the emissions stuff as well. The Haynes book I picked up is next to worthless.

2.) With Ga$ at about $3/gal, mileage is an issue (stop laughing dammit). What can I do to increase the volumetric efficiency of the 460? (I'm thinkin' dual exhaust w/headers, zappier spark, open up the induction side, etc.)

3.) Chip? Who's Chip? I don't even know what kinda computer this thing has ... but it's not OBDII. Can it be tuned via software at all?

4.) Emissions ... whether nocturnal or in broad daylight, no one cares much about emissions where I live (farm and ranch country middle O nowhere). What emissions stuff (if any) can I pull to increase power and efficiency? Do I need a cat at all (folks regularly put cat bypasses on 964's and cat it back up for smogging in Ca)?

5.) While the rig seems to run without a hitch, it does have 87K ... what all should I crack open and change fluid on in anticipation of a big road trip? Oil and trans fluid obviously. Rear diff? Drop the cover to inspect gears or just siphon it out and look at the oil? Flush brake lines? Repack wheel bearings?

6.) What else am I missing?

I know this will never be the higher mileage puller of contemporary diesels, but hey it was cheap and can be a lot of fun. I figure I coulda had a new PS or similar for another $40K. I'd like to play with this rig a bit, see if I can increase the mileage and power, then go play.

Patiently awaiting the Sages' responses ...

PS - 'wondering what trans this has, its 4 sp auto w/OD lockout button - anyone have a table decoding the trans type on the door sticker?

Thanks in advance - glw

 

Ugly,

First of all, welcome to FTE!

Can't answer all your questions, but here's some info that may help.

As far as the induction systems & their evolution, it is my understanding that all the 460 EFI systems were speed density EXCEPT the last year (1997), which is mass air. The speed density systems are somewhat limited in their adjustability. The basic system is similar to the common setup used on the Mustang, Lincoln, & other speed density Ford EFI applications. Actually, I believe in basic operation it is identical.

2) The exhaust is generally the weak link on a 460 regardless of the year; headers & a better system are a good start. They won't be cheap but you probably already knew that. The EFI exhaust port is said by some to be a little better than the earlier heads, but I have no personal experience with them (EFI heads). If you are interested in going to the extent of actually pulling the heads & modifying them, try Scott Johnston at http://www.reincarnation-automotive.com/ who has worked with the 460 extensively, including EFI heads. A good intake kit like a K&N or Gale Banks may help as well; I'd avoid any off-brands like the plague. Banks also does exhausts, & good ones, though you might have to sell the sailboat in order to afford the kit.

3) I seem to remember that Hypertech made an add-on module for this application at one point, but I might be mistaken. Gale Banks would be a place to check with as well. This should modify the sluggish advance curve for the ignition as part of the deal.

4) Most cats made from the late '80s on up are fairly efficient, as long as they are working properly & aren't plugged/melted. I wouldn't junk them myself (not even going to get into the legal issue here) but I would do/have done a pressure test on them, PARTICULARLY so if the truck was used for towing/hauling. This will verify that they aren't plugged.

5) I'd do everything you mentioned, as I automatically assume the previous owner was a complete idiot who did nothing. I'm usually right, too, which makes me wonder about my idiocy, since I bought his vehicle. (rolling my eyes)

6) I'd replace the O2 sensor(s) as well, & look at the plugs/wires/cap/rotor, replace the serpentine belt, inspect the battery/terminals, check the brakes, & look at the PS fluid quality. Air filter too, if you haven't installed a intake kit by then.

7) The transmission is almost certainly the E4OD, which is nowadays known as the 4R100. Been around for years.

I'm sure I forgot, overlooked, or just screwed up on some things, 'cause it's been just that kind of day. Have fun!

 

I have read that all CA 460 motors were Mass Air and I think one other state, maybe Mass?

 

a 68-71 timing chain set,(may already have it in 91, I dont remember) and crane roller fulcrums or roller rockers can really help.
full synthetic fluid in the trans cant hurt, it worked great in my 97 powerstroke