4.9L EFI convert over to carb......Q's

[Kaliburz]

Before you say why, this engine is NOT in a truck. Was a 'cheapo' I got for a project engine- engine and all accessories. Any how, I don't even have a computerized truck that has a computer to run it. Even though, I have the computer that us used to run the engine (engine harnesses were cut instead of unplugged).

Looking at it, the major differences are the intake, distributor and that air injection system that goes to the head. I figure, remove the FI intake and put a standard (or 4 barrel) intake, replace w/ a points type distributor OR a Duraspark distributor and plug that air port 'thing' to blow air into the intake valve said.

So, is it "that" simple? Or am I overlooking something else?

[93whitetiger]

Here is a 4-BBL intake Click here

[DieselDeaf]

I think the heads are different, aren't the injectors stabbed into the head or close enough to it that the intakes are odd shaped? Oh yeah and you might also need an electric fuel pump.

I am maybe looking at doing the same thing in an older model F150 so let me know what you find out, the older carbureted engines are getting harder to find in the boneyards. Not looking to drop a ton of money into rebuilding the old engine either.

[Kaliburz]

Injectors are in the intake manifold. But it has that air injection system on it for emissions. I'm not sure if it actually forces air into the intake side or the exhaust. I never paid attention.

I don't recall if there is a difference in the port size between carb and EFI. I've found that carb on JCW.com and was planning to get that or where ever else I can find cheap (Summit Racing?)

[checkthisout]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kaliburz</div><div class="ubbcode-body">Before you say why, this engine is NOT in a truck. Was a 'cheapo' I got for a project engine- engine and all accessories. Any how, I don't even have a computerized truck that has a computer to run it. Even though, I have the computer that us used to run the engine (engine harnesses were cut instead of unplugged).

Looking at it, the major differences are the intake, distributor and that air injection system that goes to the head. I figure, remove the FI intake and put a standard (or 4 barrel) intake, replace w/ a points type distributor OR a Duraspark distributor and plug that air port 'thing' to blow air into the intake valve said.

So, is it "that" simple? Or am I overlooking something else? </div></div>

Air injection goes to exhaust side. You are confusing the intake manifold with the exhaust manifold.

You can just plug the holes with pipe plugs if you aren't going to use it.

Having carb heat is critical on these motors. They also will get crappy mileage if you try and run one without EGR. You will be retarding spark so far that it will turn the engine into a joke.

You will need an electric fuel pump.

The best thing you can do is buy or make your own harness and keep it EFI.

[Seafarer12]

I would just find an old 300 in a junkyard and pull the dist. and intake with carb off of it. Thats all you would need besides an electric fuel pump since there is no place for a mechanical pump.

What would be even better would be to get the wiring out of a junkyard and put fi in the truck. I have a truck with a carb on it and it will be my last.