Efi to carb intake
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Mountain Pass
Joined: May 2020
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Efi to carb intake
I put a 1986 300il6 into a 1962 Ford F100. Due to time and cost restrictions, I was forced into using the factory efi intake. Cheapest 2 bbl I could get was a Holley 2300. I bought a spacer fir this application. The carb bolts to it, but when bolting to the intake, the holes are about a bolt diameter to close on the spacer. Is there a difference in the carberator bolt holes on an efi intake vs the carb intake?
Logistics Pro
Joined: May 2015
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From: Tri Cities, TN
Are you sure you have a 1986 engine since the 300 didn't get FI until 1987. If the manifold, you have was for throttle body injection you will have to modify the manifold or adaptor. If it is for a true EFI from the 1990's you need a different manifold.
FTE Legend
Joined: Nov 2015
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From: Angier, NC
I would like to see pictures of what you are working with as far as I know there is no way to use the EFI intake with a carb 
FYI EFI started in 87 till the end of the 300 six.
You can take the factory v1 carb or aftermarket v4 intake and bolt it to a EFI head.
The EFI head I am told has think 2 more bolts to hold it to the head than a carb head but can be swapped back and forth if need be I am told.
For a little more power you can use EFI EXH Tri Y manifolds and factory Y pipe with the factory v1 intake or aftermarket manifold.
The only thing you need to do is place all the manifolds on a flat surface to see if the bolt washer bosses are even.
IIRC the EFI EXH manifolds were a little taller than the v1 factory intake. I used a belt sander to make the EXH manifolds level with the intake.
Also note in 83 or 84 the carbed 300 six went to a feed back (FB) computer controlled timing and carb.
You can tell the FB dist dose not have a vacuum advance can and the carb has a bunch or wires going to it.
Most replace the dist. with a HEI one and older pre-FB carb if not going after market intake.
Hope that helps
Dave ----
FYI EFI started in 87 till the end of the 300 six.
You can take the factory v1 carb or aftermarket v4 intake and bolt it to a EFI head.
The EFI head I am told has think 2 more bolts to hold it to the head than a carb head but can be swapped back and forth if need be I am told.
For a little more power you can use EFI EXH Tri Y manifolds and factory Y pipe with the factory v1 intake or aftermarket manifold.
The only thing you need to do is place all the manifolds on a flat surface to see if the bolt washer bosses are even.
IIRC the EFI EXH manifolds were a little taller than the v1 factory intake. I used a belt sander to make the EXH manifolds level with the intake.
Also note in 83 or 84 the carbed 300 six went to a feed back (FB) computer controlled timing and carb.
You can tell the FB dist dose not have a vacuum advance can and the carb has a bunch or wires going to it.
Most replace the dist. with a HEI one and older pre-FB carb if not going after market intake.
Hope that helps
Dave ----
FTE Legend
Joined: Nov 2015
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From: Angier, NC
I thought the TB was mounted to the upper intake and to the front?
How are you then mounting the carb?
Or did you replace the upper intake with something the carb can bolt to?
I just cant see how you are doing this and why a picture.
Dave ----
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Mountain Pass
Joined: May 2020
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Carb fix
here is what I'm using. The intake is off a 1985 4.9l fitted for a factory 1bbl. I'm installing a Holley 2300 Avanger carberator. The adapter is a Trans Dapt 2044. The issue is the carb mounting bolt holes on the intake are 3 inches apart. The bolt holes in the adapter are 2 5/8 inches apart. I couldn't find an intake with 2 5/8 holes. I took the adapter to a machine shop and they are going to fill the adapter holes and redrill it to fit.
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FTE Legend
Joined: Nov 2015
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From: Angier, NC
You said EFI but I am not seeing anything EFI and why I could not figure what it was you were trying to do 
Ok factory intake for the 85 but I am not seeing the EGR plate that fits between the manifold and carb and covers (seals) that big hole.
Also with out the EGR plate the carb sits too low and the throttle linkage dose not hook up right but may not be an issue for you with the adapter?
On the bolt holes from what I have see posted and the gaskets I got with my Ebay carb there are 2 different sizes.
The closed ones I think are on the early straight six motors like the 240?
The wider hole ones are on the later 300 six.
On carbs they say use a round file and open them up a little and it will work.
So you did just what you needed to do.
I will say when putting this together check all the gaskets and the mounting parts to make sure they will seal.
I say this because on the AMC 258 six that use an adapter for the think Webber carb or maybe the Holley 2300, the way the adapter is made the gasket dose not seal. It just misses sealing it and had to look really really close for it.
You need to fill a void with RTV before putting it together.
Dave ----
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FTE Legend
Joined: Nov 2015
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From: Angier, NC
I do have to ask how much more power over the v1 factory carb do you think you will have choking down that 2300 Holley to the small factory manifold?
I am using the factory v1 carb but EFI EXH manifolds as they flow better than the log manifold and full 1994 EXH system as the pipes are bigger than the 1981 pipes and a Thrush welded muffler for better sound.
I cant say how much better than factory as I never drove the truck any other way.
Dave ----
I am using the factory v1 carb but EFI EXH manifolds as they flow better than the log manifold and full 1994 EXH system as the pipes are bigger than the 1981 pipes and a Thrush welded muffler for better sound.
I cant say how much better than factory as I never drove the truck any other way.
Dave ----
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