302 to EFI351 swap - Ford Bronco Forum
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post #1 of 85 (permalink) Old 09-11-2003, 09:46 PM Thread Starter
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Post 302 to EFI351 swap

I decided to toss this togeather cause there seems to be ALOT of threads open lately all about the exact same swap.

Parts list:
New Intake need upperand lower, the gasket patern is diffrent from 302/351. So you can't mix an upper and lower between the two. The 302 uses squared ports and the 351 uses oval ports. If you get an intake from a junk yard it will have the matching fuel rail.


Fuel Rail The 351 is a wider engine so to keep the injectors nice and close to the intake valves the fuel rail is wider. You can get this with the intake from the junkyard.

Distributor the 302/351 distributors look the same but... The only difference between the 2 are the oil pump drive is larger on the 351

Computer You must get a 351 computer from a truck just like your 302. If you have a E4OD transmission you must get a 351 computer from an E4OD truck. You should be able to get this off a junkyard truck just like the intake. Just don't get one that was on a flood damaged vehicle

Exhaust Crossover The 351 is a wider engine so to connect to the exhaust manifold you'll need a wider corssover. There are a few options to acomplish this. The stock crossover's are part of the first converter, so it is an expensive part to buy new. You can get it used, or have an exhaust shop build you something custom. remember to keep O2 sensor and install it about 6-12" away from the cylinder head

Oil Pan The 351 has a larger crank with larger main journels. So the 302 pan won't fit onto a 351, and a 351 pan won't seal on a 302.

Ill be updating this as time allows, pictures and more details to come :)
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post #2 of 85 (permalink) Old 09-11-2003, 10:04 PM
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Looking good!

89 Bronco 302 EFI Red on white 31x11.50sChrome wheels. Lift if any unkown.<<Project Total restore>>


86 Bronco 302 EFI .60 over rebuilt head's.. Blue on tan Eddie Bauer 33x12.50s centerline wheels.Lift if any unkown.<<Project Mud Slinger>>

86 Mustang GT>5.0 EFI>5 speed>
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post #3 of 85 (permalink) Old 09-11-2003, 10:05 PM
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thank you fireguy... your my hero

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post #4 of 85 (permalink) Old 09-11-2003, 10:27 PM Thread Starter
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Exclamation HARNESS

The harness is a big part of the EFI system.

If you study this web page:
http://oldfuelinjection.com/truckpinouts.html

You'll notice that the 300 / 302 / 351 / 460 from 1987-1995 Trucks, Vans, and Broncos all use a harenss very simpular to each other. You can use your original engine harness, so be very carefull with it as you remove the old engine.

If you had a 302 you DO NOT need to make any modifications to the harness.

If you had a 300 you will need to adjust the fuel injector connectors for the V8. It's not really hard work, just unwrap the harness and strech it around, then...
Piggyback one injector to the original #1 injector.
Piggyback a second injector to the original #2 injector.
The good part about this EFI harenss is that the connectors will only fit onto the corect part. So now install the engine and lower intake. Hook up the injectors, then strech the Air Charch Temp sensor and Engine Coolant Temp sensor plugs to reach the new locations.
Now get out the upper intake with throttle body installed. Notice all the connectors on the throttle body and look at the connectors left on the harness. Get a rough idea where you need to strech the remaining connectors to.

If you had a 460, Why are you installing a 351
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post #5 of 85 (permalink) Old 09-12-2003, 05:47 AM
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lookin good, ryan!

I've been on & off for awhile... finally realized that broncos are in my blood. username/account stats fixed by redwagon, thanks brotha!

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post #6 of 85 (permalink) Old 09-12-2003, 08:25 AM
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Nice work FG... As far as things like bracketry go, shouldn't the brackets from the 302 bolt up to the 351. Also, isn't there a difference in the deck height between the two, in addition to the 351 being wider?
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post #7 of 85 (permalink) Old 09-12-2003, 03:07 PM
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heh i did a tech writeup covering the same facts for FTE and submitted it, he said that he would post it and send me a t-shirt, but that was a few months ago and nothing sofar,

but all the same good writeup
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post #8 of 85 (permalink) Old 09-12-2003, 04:40 PM Thread Starter
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Exclamation Throttle Body

They both use the same throttle body and EGR valve. They use different exhaust tubes to connect the EGR to the exhaust. The 302 gets exhaust from the lower intake, while the 351 gets exhaust from the passanger exhaust manifold.


Off Topic note: the 460 uses the same throttle if you need a throttle
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post #9 of 85 (permalink) Old 09-13-2003, 07:15 AM
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nice way to add all the pics, ryan!

I've been on & off for awhile... finally realized that broncos are in my blood. username/account stats fixed by redwagon, thanks brotha!

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post #10 of 85 (permalink) Old 09-15-2003, 09:10 AM
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Way to go man. Glad to see you could make use of my pic.
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post #11 of 85 (permalink) Old 09-21-2003, 09:13 PM Thread Starter
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I re-posted the pictutres after superford lost them.
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post #12 of 85 (permalink) Old 09-25-2003, 12:56 AM
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I am wanting to do this swap. The junk man tells me that my flywheel wont work because it is balanced for a 302. I have a mazda 5 speed. Do you know if my 302 flywheel will work?
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post #13 of 85 (permalink) Old 09-25-2003, 01:12 AM Thread Starter
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hmm I'm not to educated on the manual trans stuff, But I know the auto flex plates are different. I'd sugest getting a new flywheel
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post #14 of 85 (permalink) Old 09-25-2003, 09:56 AM
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You'd have to rebalance the flywheel. I'd also highly suggest replacing the transmission. Those Mazda trannys are marginal behind 302s.... snap like twigs behind 351s.
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post #15 of 85 (permalink) Old 09-25-2003, 12:41 PM
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Quote:
Originally posted by slim
I am wanting to do this swap. The junk man tells me that my flywheel wont work because it is balanced for a 302. I have a mazda 5 speed. Do you know if my 302 flywheel will work?
nope It wont work, You didnt fill out your sig line, but if you got a Mazda 5 speed your trucks at least an 87, putting it at least 5 years after they changed to 50 oz balance... 351s are always and will always be balanced at 28.

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post #16 of 85 (permalink) Old 10-01-2003, 03:52 AM Thread Starter
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How to identify a 351

It's not easy to pick a 302 from a 351 in a line up.
One quickest and easiest way to ID a EFI302 from EFI351 is to inspect the EGR system. They use different exhaust tubes to connect the EGR to the exhaust. The 302 gets exhaust from the lower intake, while the 351 gets exhaust from the passanger exhaust manifold. Much quicker and easier than measuring the lower intake.

Below is a 351 EGR:


Below is a 302 EGR:


The positive ID is to measure the lower intake
302 is aprox ~ 8 inches wide
351 is aporx ~ 11 inches wide
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post #17 of 85 (permalink) Old 10-01-2003, 04:03 AM
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post #18 of 85 (permalink) Old 10-01-2003, 04:11 AM Thread Starter
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As if you actually remember all 2600 pictures you have on superford. but yes, they be yours. Get me some of the 302 EGR tube. I'd ask for 1 but you like to take pictures
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post #19 of 85 (permalink) Old 10-01-2003, 12:23 PM
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Will do, I'll get them today.
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post #20 of 85 (permalink) Old 10-01-2003, 12:24 PM
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Glad you can tell the diff with the engines in the truck... Or EFI engines only. To me it makes a little more sense to mention the block difference along with it.

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