1989 460-EFI to Carb conversion - 460 Ford Forum
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post #1 of 19 (permalink) Old 12-14-2007, 07:14 AM Thread Starter
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1989 460-EFI to Carb conversion

Hi, I purchased a 1989 460 that is EFI. Can I obtain an intake manifold somewhere to be able to run a carburetor ? Or, can I use the existing manifod and cap-off the injector holes ?
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post #2 of 19 (permalink) Old 12-14-2007, 11:57 AM
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Re: 1989 460-EFI to Carb conversion

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Originally Posted by Joe Speno
Hi, I purchased a 1989 460 that is EFI. Can I obtain an intake manifold somewhere to be able to run a carburetor ? Or, can I use the existing manifod and cap-off the injector holes ?
Your only real choice is to get an adapter to adapt the fuelie elbow pad for use with a carb. They are available from several sources.

You would then plug the injector bosses.

I have converted victor intakes for use on fuelie heads but that is an expensive proposition. There are not bolt on carb intakes for the fuelie heads at this time.



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post #3 of 19 (permalink) Old 12-14-2007, 02:17 PM
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I remember at one time seeing an adapter plate to put a 4 bbl on the FI intake...don't remember who sold it.

I would just leave the injectors in the holes.

This is how you make a 40 psi pump deliver 6-7 psi.:

Make a "T" fuel junction and let the 40 lbs of fuel pressure shoot strait across the "T" and return back thru a 90 degree turn. (see pic)

Ignore the arrow...it is backwards...the flow from the tank comes in on the top and the return is the bottom line.

The residual back pressure on my car is exactly 6 lbs. at idle and 6.5 lbs above idle (due to a voltage increase)



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post #4 of 19 (permalink) Old 12-14-2007, 04:27 PM
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Carb adapter for EFI intake manifold.

Price Motorsports has an adapter available.
www.pricemotorsport.com

Part No. CS-460EFI

Easiest way to put a carb on a 460EFI engine.

Nothing exceeds like excess.
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post #5 of 19 (permalink) Old 12-14-2007, 07:09 PM
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That adapter looks neat.

I just wonder how well that EFI intake works with a carb? Probably signs off around 4,000.

Alan Mackin

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post #6 of 19 (permalink) Old 12-15-2007, 08:07 AM
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Its gatta be better than breathing thru 1/2 inch holes in the air tubes. :shock:
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post #7 of 19 (permalink) Old 12-15-2007, 10:05 AM
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This almost looks like a neat experiment for this forum. :idea:

Be even better if it could be put on a dyno and chart the difference between that EFI intake and say a factory 4 bbl or Performer, using the same carb on both.

Does anybody know if the EFI intake fits D3 heads?

Alan Mackin

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post #8 of 19 (permalink) Old 12-16-2007, 11:21 PM Thread Starter
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Thanks everyone...great input.

Thank you everyone...I appreciate the input.
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post #9 of 19 (permalink) Old 12-27-2007, 04:27 PM
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EFI '80 460

What I did was weld a 2" spacer onto the EFI Intake and welded the injector holes shut. The motor is fresh stock motor, with a 750 vac. Holley carb. and pulls strong up to around 5200 in a '77 F150. I will try to post pic. soon. When I put this together, last summer, nobody offered an Intake for the EFI engine.
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post #10 of 19 (permalink) Old 12-27-2007, 05:34 PM
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stock vic jr,, bolts right on, or use a scj intake, just rember that u will have to use a scj/cj intake gasket for the latter, we have done this many times,

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post #11 of 19 (permalink) Old 12-27-2007, 09:11 PM
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An adapter is pretty easy to build. Or get the Price Motorsports one. There is a severe port mis-match from carb intakes to efi heads. I built this adapter a few years ago for a friend.

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post #12 of 19 (permalink) Old 12-28-2007, 04:32 AM
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post #13 of 19 (permalink) Old 12-28-2007, 10:03 PM
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I have a '89 460 in my '79 bronco.



Have been running this engine like this for about 1 1/2yrs now. I'm running a 4bbl adapter on the stock intake. I also opened the ports on the intake and the heads up (intake and exhaust). And the heads were milled down 0.125 , which should give me around 9.5 or a bit higher compression. I'm running the stock cam right now, but would like to go with an aftermarket cam. I talked with a guy that builds a lot of engines for mud drags and so and he said i could run a fairly big cam without valve to piston contact. I was a bit worried about that. What cam do you guys think would be a good choice? The truck can idle a bit rough, wouldn't bother me. I'm looking more for higher rpm hp, like in the 2500-5500rpm range.

Any help would be appreciated
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post #14 of 19 (permalink) Old 11-13-2010, 05:48 PM
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I am thinking about this conversion but keeping the injection and using mustang throttle body. I wonder what rpm the lower will see without the long runner upper??
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post #15 of 19 (permalink) Old 11-13-2010, 09:19 PM
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That would be interesting, a 1000 CFM throttle body on the fuelie intake and larger injectors and an aftermarket computer. I wonder what could be accomplished?! And forced induction.

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