EFI to carb
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Senior User
Joined: Apr 2003
Posts: 166
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From: Cincinnati, Ohio
EFI to carb
What would you need to swap from EFI to a carb set-up? Want to swap for nothing more than a simplier truck that I can actually drive and work on. I have been searching for what is causing my truck not to run for two months now. Haven't found much help on this board, hope you guys can help me on this. Save the comments on "Why would you want to do that for, EFI is better..." just looking for answers on the question asked. Thanks.
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Joined: Jul 2003
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From: Davenport, IA
EFI to carb
I'm looking into the same thing for my 87 f150. From reading past posts from this and a couple other boards this is what I've got so far:
manifolds/carbs - go junkin for a intake/exhaust stock set up off an 85 or older or get offy or clifford intake for 2 or 4 bbl and headers - I read one of those will also work with the efi exhaust manifold
change the distributor as the efi one needs the computer input - simple pull and replace
fuel pump - the efi block has everything for a mechanical fuel pump except the hole in the block - either machine the hole or change to electric - either way the high pressure efi pump has to go.
plug the holes in the head from the (forgot the name of it) air injector thingy...
As I say this is all stuff I've read so far - I have no idea if it's correct ... hopefully if it's not someone will set me straight
manifolds/carbs - go junkin for a intake/exhaust stock set up off an 85 or older or get offy or clifford intake for 2 or 4 bbl and headers - I read one of those will also work with the efi exhaust manifold
change the distributor as the efi one needs the computer input - simple pull and replace
fuel pump - the efi block has everything for a mechanical fuel pump except the hole in the block - either machine the hole or change to electric - either way the high pressure efi pump has to go.
plug the holes in the head from the (forgot the name of it) air injector thingy...
As I say this is all stuff I've read so far - I have no idea if it's correct ... hopefully if it's not someone will set me straight
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Senior User
Joined: Apr 2003
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From: Cincinnati, Ohio
EFI to carb
Thats about what I had on my list. I would like to know what year would make the best donor. I live where emissions is not a concearn so as simple as possible would be good for me. A guy at my work has the intake manifold, I would use the EFI exhaust manifolds, and if needed a new dist from an 80 300ci is $49 ($30 core) new at autozone. I was wondering how the ignition would need to be modified to work (if at all), or what other wiring would need changing. Give me your e-mail and we can ex-change any and all info that we find. It seems good info can be hard to find on this.
jamesmonty2003(No Email Addresses In Posts!)
jamesmonty2003(No Email Addresses In Posts!)
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Joined: Jul 2003
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From: North of Toronto, Ontario
EFI to carb
Gentlemen, I did this exact project last summer. So far everything posted is correct. Next, buy an aftermarket coil that will run on 12 full volts (not 8 V like the stock one). Get the complete engine wiring harness from your older 6 cyl. truck (197? - 1985). Plug in your distributor, wire in your new coil, and then mount an older style ignition module in the engine bay and plug in your harness. (I think that this is called the Duraspark 2 module). The power for your module can be supplied also from your coil wire. Now get the coil wire, oil pressure wire, temp guage wire, and tach wire, and splice them into where the origional ones exit out through the fire wall.
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Joined: Jul 2003
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From: Davenport, IA
EFI to carb
I think servin_time 's posts are where I got alot of my info from in the first place... what carb/manifolds did you end up using?
Simple is what I'm looking for too. The 300 was intro'd in 65 (I think) and I wouldn't mind having a carb from the early yrs - 1bbl carb, hand choke, and points - doesn't get much more simple! (like my 64 had - check the avatar)
After reading this board though, I'd kinda like to go a little more fancy - triple carbs...new cam...throw simple out the wing window! Well, at least new carb/manifold/headers would be ok, which is what I may eventually go for.
Right now, I need to get it running without too much fuss. So I'm gonna check the local junk yards and see what I come up with. (never know, I might find gold!)
samfear@mchsi.com
Simple is what I'm looking for too. The 300 was intro'd in 65 (I think) and I wouldn't mind having a carb from the early yrs - 1bbl carb, hand choke, and points - doesn't get much more simple! (like my 64 had - check the avatar)
After reading this board though, I'd kinda like to go a little more fancy - triple carbs...new cam...throw simple out the wing window! Well, at least new carb/manifold/headers would be ok, which is what I may eventually go for.
Right now, I need to get it running without too much fuss. So I'm gonna check the local junk yards and see what I come up with. (never know, I might find gold!)
samfear@mchsi.com
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Senior User
Joined: Apr 2003
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From: Cincinnati, Ohio
EFI to carb
Your parts find looks good. Is there anyway to seperate the exhaust and intake manifold? The efi manifolds would be so much better. Good luck, for now my efi is running again so i'm just collecting parts and money to do mine later this summer.
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Joined: Jul 2003
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From: Davenport, IA
EFI to carb
yep, the manifolds come apart - 3 bolts. I used the stock efi exhaust manifold, but had to cut a couple spots off with a recipricating saw. (check the picks in my gallery)
Actually had it turning over (firing through the carb though)
Actually had it turning over (firing through the carb though)
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Posting Guru
Joined: Jul 2003
Posts: 1,398
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From: Davenport, IA
EFI to carb
Finished the transformation:
'87 f150
Intake manifold and stock carb off a '79 f100
Ditributor/coil(12V)/module off an '83 f150
Electric fuel pump.
Used stock efi exhaust manifold - had to trim both manifolds slightly so they would fit together. Far back manifold bolt doesn't touch manifold - shimmed it.
Plugged several vacuum ports in carb and spacer block (and intake manifold). Manual choke cable - manual choke had already been installed on carb previously. Made a temporary accelerator cable bracket - efi cable and '79 bracket don't match up.
Disconnected high pressure pump and installed 5.5 to 9.0 psi electric pump.
Distributor - one out, one in. Timing for #1 TDC is on the passenger side of the block (look like teeth, not the #'d marks on the timing gear cover) Timing mark on damper is very small (not the big notch).
Wiring harness - GOOD LUCK! Tracing wire colors can be a pain, to say the least. I am now EEC free though. (Took 2 days to do everything else - took 3 days to get the harness hooked in right!)
I still need to redo the exhaust and fine tune the timing and carb. (may overhaul the carb eventually) but it runs well enough already.
'87 f150
Intake manifold and stock carb off a '79 f100
Ditributor/coil(12V)/module off an '83 f150
Electric fuel pump.
Used stock efi exhaust manifold - had to trim both manifolds slightly so they would fit together. Far back manifold bolt doesn't touch manifold - shimmed it.
Plugged several vacuum ports in carb and spacer block (and intake manifold). Manual choke cable - manual choke had already been installed on carb previously. Made a temporary accelerator cable bracket - efi cable and '79 bracket don't match up.
Disconnected high pressure pump and installed 5.5 to 9.0 psi electric pump.
Distributor - one out, one in. Timing for #1 TDC is on the passenger side of the block (look like teeth, not the #'d marks on the timing gear cover) Timing mark on damper is very small (not the big notch).
Wiring harness - GOOD LUCK! Tracing wire colors can be a pain, to say the least. I am now EEC free though. (Took 2 days to do everything else - took 3 days to get the harness hooked in right!)
I still need to redo the exhaust and fine tune the timing and carb. (may overhaul the carb eventually) but it runs well enough already.
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Fleet Mechanic
Joined: Jul 2003
Posts: 1,614
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From: Springfield, PA
EFI to carb
Sounds like an interesting project. Just a note on the timing marks on your gear cover. Those marks that are so easy to read from the distributor side are from the original casting for the cover from way back in sixty-something. To make timing adjustments a one man job, simply line up the timing mark on your damper with the bolt-on timing plate you can't see anyway, and then make another mark on the balancer by the marks on the timing gear cover. This way you can hold your timing light in your left hand while turning the distributor with your right.
Another question: Has anybody here looked into modifying the timing advance curves for these engines after making changes like headers, cams, carbs, etc.? There's no changing the EEC distributors w/o some chip or programming, how about the earlier Durasparks? Any recurve kits out there? Time tripping back to points and mechanical advance weights and springs is just a little too nostalgic for me.
Another question: Has anybody here looked into modifying the timing advance curves for these engines after making changes like headers, cams, carbs, etc.? There's no changing the EEC distributors w/o some chip or programming, how about the earlier Durasparks? Any recurve kits out there? Time tripping back to points and mechanical advance weights and springs is just a little too nostalgic for me.
Posting Guru
Joined: Jul 2003
Posts: 1,398
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From: Davenport, IA
87 f150 update
My 87 is still running fine - still need to rebuild the carb though.
Riddle:
The rear tank (dual tanks) empties into the front tank while the truck is off. Only if I have the tank switch set for the rear tank. I've never studied the situation carefully, but I can leave work with 1/2 a tank of gas in the rear tank and start out the next morning with it all in the front tank?!
Anyone have ideas?
Riddle:
The rear tank (dual tanks) empties into the front tank while the truck is off. Only if I have the tank switch set for the rear tank. I've never studied the situation carefully, but I can leave work with 1/2 a tank of gas in the rear tank and start out the next morning with it all in the front tank?!
Anyone have ideas?
Elder User
Joined: Sep 2004
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From: P-Town, CA
Originally Posted by jamesmonty
I live where emissions is not a concearn so as simple as possible would be good for me.
I never knew that a metropolotain area like cincinati wouldnt have emissions crap.