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View Full Version : 1990 302 EFI to 1985 460 carb conversion Help


FordMclovin
06-09-2008, 08:54 PM
Hello,
I am new to this I am thinking of buying this 460/propane setup for my 1990 f150 302 efi. My plans are 15" total lift with dana 60 front dana 70 rear np205 with 44"boggers for the mud. Fun truck, My question is what am i going to be removing, and what things am I going to need to buy for this job. New mounts, wiring harness all that fun how hard is it going to go from EFI to carb? Now im ripping out the computer and stuff or should I stay EFI.
Any info or anything you can ask me to help me with this would be perfect.
Thank you
Chris

epic3
06-10-2008, 10:12 AM
why not 460 efi?

FordMclovin
06-10-2008, 05:21 PM
I dont know, seems to me I cant find any 460 EFI around. So i found a 460 carb with a propane for decent price. But, im not sure if its going to be too big of a job for me to go from EFI to carb? With my ideas is a 460 too big for my truck or should I look into a 351 done up?

bforce
06-10-2008, 07:20 PM
IMO I would stick with an EFI set up. Better for offcamber wheeling. Carbs will sputter out on decent grades/angles. I like the idea of a 351 EFI...

As for ease, turning something to carb from EFI is pretty easy... As most sensors and computer junk is not needed. However you would probably also need to get a different tranny to work with the non EFI set up as they have sensors that the ECU uses to determine mixture, etc etc etc...

FordMclovin
06-10-2008, 11:10 PM
Just a question will a 351 be able to push 44 or 46? or am I going to need to put a 460 in for that?
Thanks

In The Zone
06-11-2008, 06:15 AM
It will turn em easy

u will gain more torque through proper gearing (R&P) as your wheel diameter increases

460 on propane why change it?
if you do go efi
or swap the propane to the 351
gas aint cheap

propane is.

FordMclovin
06-11-2008, 08:40 AM
Because with some reading a 460 in a f150 is a bit much on the frame so if i could maybe find a 351 efi and get it redone with new heads and bore and cam it to get some juice out of it. For the nice hill climbs up the step power lines but yet a 460 on propane would just be narly.

WagoneerXJ
06-11-2008, 06:23 PM
why 15" of lift?

boyzen
06-11-2008, 08:23 PM
easy swap done lots just need to go with duraspark ignition ,or msd ,351 motor mounts and the 460 plate . you will need the 460 tranny to.

boyzen
06-11-2008, 08:24 PM
IMO I would stick with an EFI set up. Better for offcamber wheeling. Carbs will sputter out on decent grades/angles. I like the idea of a 351 EFI...

As for ease, turning something to carb from EFI is pretty easy... As most sensors and computer junk is not needed. However you would probably also need to get a different tranny to work with the non EFI set up as they have sensors that the ECU uses to determine mixture, etc etc etc...

dude you know shit about propane cause it will run upside down where even fuel injection fails

FordMclovin
06-11-2008, 08:42 PM
Because 12" lift is the needed lift to clear 44 but I also thought about the big mickey thompsons 46"s so 15" would be safe for the truck. My tranny is the same tranny the 460 is coming out of a borg warner t-19 4 speed so it should go right in with the mounts. Whats a 460 plate?

bforce
06-12-2008, 09:42 AM
dude you know shit about propane cause it will run upside down where even fuel injection fails

Meh, forgot it was a propane version... Dont get why you would go propane when you want power... Good way to waste bedspace and a decent 460...

radman
06-12-2008, 10:19 AM
theres no replacement for displacment, do it.

brothergrimms
06-12-2008, 10:57 AM
other one that dont know shit about propane gas octane max at 97propane octane is 110 plus i run small block and big block on propane i'll never go back to gas on a bush rig and bforce you dont know shit about propane go back to school[16]

bforce
06-12-2008, 11:45 AM
Fuck it you right I don't know squat about propane... whoop dee fucking doo... At least i tries answering the OP instead of wasting my time flaming people.... Little dick fucks...

brothergrimms
06-12-2008, 02:01 PM
hey clown come visit me i'll show you who the little fuck is must people who know pipe up now dumb fucks like you should not open their mouths or in this case type............stupid fuck

toyon35s
06-12-2008, 02:09 PM
Fuck it you right I don't know squat about propane... whoop dee fucking doo... At least i tries answering the OP instead of wasting my time flaming people.... Little dick fucks...

just a word of advise ,learn who your speaking to or about ,lipping off can get you in trouble round these parts,remember if you wheel good chace you will run into these people you lip off to[16] [16]

FordMclovin
06-12-2008, 03:57 PM
Sweet Bforce, okay im going propane no matter what. At 74.9 cents compared to 140.9. My friend runs propane and says the same thing will never go back on a bush rig. K so if the 460 is hooked up to a t-19 and my truck has a t-18 borg warner with a 302 efi does this mean I have to swap up my tranny too or just get a new bellhousing for the 460?

bforce
06-13-2008, 04:12 PM
Meh, Keyboard tough guys...Don;t have time, I messed up I admit... Life continues...

You would need a new bell housing to keep the T-18 as it was on a SB... IMO i would keep the T-19 just for the ease of install...The gearing should be the same either way... Also need to check it its compatible with the T-case.

FordMclovin
06-14-2008, 12:49 AM
Hello with lots of thoughts,
I think a 460 in a f150 is too much engine for the truck..
I think i may go with a 351 done to the balls with 4:11 knowen as 4:10 gears for 46 mickey thompson. How does that sound or should i still go with a 460?
Chris
1st project..

kootenaycat
06-14-2008, 09:05 PM
No replacement for displacement...........as already stated! I'd do it, when in the mud, you can't beat gobs of torque to keep those big tires turning fast.

Explorer guy418
06-15-2008, 09:51 AM
my opinion 351 suck.. 5.0 Done out or 460.. i had a 5.0 And it had tons more power then my buddies 351. and i am driving a f250 with a 460 in it now and it kicks ass....

bforce
06-15-2008, 02:13 PM
46s with 4.10 even behind a 460 will be alot of meat to turn... I would jump to at least a 4.56 with a 460, even lower with a 351 or 5.0...

WagoneerXJ
06-15-2008, 04:48 PM
my opinion 351 suck.. 5.0 Done out or 460.. i had a 5.0 And it had tons more power then my buddies 351.

depends on wether your engine and your buddies were stock, and what vehicle they were in.

kootenaycat
06-15-2008, 09:03 PM
depends on wether your engine and your buddies were stock, and what vehicle they were in.

If you put enough money into any engine (5.0, Windsor or a BB) they will put out some serious HP. My Brother n Law builds Fords for a hobby, rode in a few of his toys from a mild 5.0 in an '82 GT to a Windsor stroked to a 408. Holy shit does that motor have a shit load of torque! And his Tiger with a 337 stroker is insane. It's all about the money.

bustamove
06-15-2008, 09:40 PM
propane vs gas. question. i know propane is cheaper than gas. but i thought you used more propane to air mixture compared to gas. like isn't gas 14 to1. and propane like about 8-10 to 1. im just guessing. and i also heard a myth propane burns dryer or tends to leave less oil on the cylinder walls and such.

kootenaycat
06-16-2008, 10:40 PM
propane vs gas. question. i know propane is cheaper than gas. but i thought you used more propane to air mixture compared to gas. like isn't gas 14 to1. and propane like about 8-10 to 1. im just guessing. and i also heard a myth propane burns dryer or tends to leave less oil on the cylinder walls and such.

Propane definitely burns cleaner, little or no blowby so oil stays clean a long time. Never studied propane or worked on a propane vehicle, so can't help in the technical questions. I've heard both sides to it, some say it's cheaper (for now at least) but you don't have the same power. Others say with the higher octane you can get gobs of power out of it. Anyone seen propane with a turbo? Brad Story has a Yammy with that setup, and I've seen a couple of imports too.

WagoneerXJ
06-17-2008, 05:32 PM
My Brother n Law builds Fords for a hobby, rode in a few of his toys from a mild 5.0 in an '82 GT to a Windsor stroked to a 408.


I just had a 420hp 358 CID Windsor built for my 84 GT. That shit is gonna be fun :happy0045:

Always broke
06-17-2008, 09:58 PM
For the money side i would go with the Big block you can make huge power with a small block but you got to put a small fortune to match the stock torque of a big block , Propane if it is set up right can work very well (Recurve the dist,up the compression ) propane likes running at about 11 to 1 compression .

On the same note you can make huge power with a small block but the money is going to be put in every time you wear it out as the big block you just find another stock one and install it in and you are good to go all over again ,where you will have to put huge amounts of money in again each time with that small block (But small block don't break as many parts ask Deaner)