302 to 351 engine swap
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302 to 351 engine swap
I have a 1990 F250 with a 302 (5.0) and it just threw a rod. I was thinking on replacing it with a 351. Have access to one with No heads. My question is will the 302 heads work and what else will I have to change out, ie wiring, computer, sensors ect? Has anyone out there done this? Or can anyone help me out with some answers?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Both motors use the same heads so the ones you have will bolt right on after you bore out the main bolt holes to 1/2"(the 302 used 7/16" head bolts). However, the intake, distributor, oilpan, and timing cover are all unique to the 5.8 and those parts will not transfer from the 5.0, so you're probably gonna need a complete 5.8 EFI anyway. You will also need a 28oz flexplate or flywheel for whatever transmission you have, the 5.0 version is 50oz, and also a 5.8 computer that matches your trans. If the truck has a manual or C6 auto you have more computer options as either version will work since neither are computer controlled. If however the truck has an E4OD then you need a 5.8 computer for that trans only. With the correct computer no other wiring changes are necessary, all the sensors and actuators are in the same place on both motors so it will plug right in. The only other thing that has to be addressed is the exhaust, the 5.8 block is taller and wider so the Y pipe has to be widened.. if so equipped.
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Have a wealth of information from you so far. However, I have a '87 4x4 F150 with 302 windsor and C6.
I have bought a '93 5.8 with the wiring loom and computer. BUT, it's all from a left hand drive F-truck so I guess I'm going to have some problems fitting etc and firewall sockets and later instrumentation I don't have. Also the wiring loom is meant for the E4OD? transmission. Is there any way I can get the existing 302 computer re programed to drive the 5.8 with the existing loom? Not too worried about all the EGR as the vehicle is fitted out with LPG and uses this 99% of the time.
Thanks,
Phill. QLD
I have bought a '93 5.8 with the wiring loom and computer. BUT, it's all from a left hand drive F-truck so I guess I'm going to have some problems fitting etc and firewall sockets and later instrumentation I don't have. Also the wiring loom is meant for the E4OD? transmission. Is there any way I can get the existing 302 computer re programed to drive the 5.8 with the existing loom? Not too worried about all the EGR as the vehicle is fitted out with LPG and uses this 99% of the time.
Thanks,
Phill. QLD
Junior User
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Apologies. I asked that question in an older thread of mine, then started my own thread and still didn't get anything. When you mentioned using an e4od puter in a c6 truck I thought you may know. Didn't mean to hijack .
Z
Z
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
My comment about starting your own thread was to give it visibility, and if you do that use a thread title that clearly identifies what your question is about don't be ambiguous, that will get the most attention and the best answers. When you burry a question at the end of another thread people often overlook it because they assume you are just contributing to the OPs question not posing your own question, so they often don't even look even if the thread is at the top of the forum.
As for your question you can use the '90 harness but there is no guarantee it is directly plug and play. It will have a bunch more wiring that the '89 obviously and you will have to verify the EEC pinout is the same. Yo do not want to use the E4OD computer however as it will throw a ton of codes when it doesn't see that transmission.
As for your question you can use the '90 harness but there is no guarantee it is directly plug and play. It will have a bunch more wiring that the '89 obviously and you will have to verify the EEC pinout is the same. Yo do not want to use the E4OD computer however as it will throw a ton of codes when it doesn't see that transmission.
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Have a wealth of information from you so far. However, I have a '87 4x4 F150 with 302 windsor and C6.
I have bought a '93 5.8 with the wiring loom and computer. BUT, it's all from a left hand drive F-truck so I guess I'm going to have some problems fitting etc and firewall sockets and later instrumentation I don't have.
I have bought a '93 5.8 with the wiring loom and computer. BUT, it's all from a left hand drive F-truck so I guess I'm going to have some problems fitting etc and firewall sockets and later instrumentation I don't have.
No. Are you using an E4OD or the C6? If it's the latter then you need a computer for a 5.8 and a manual or C6 truck.
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Logistics Pro
Joined: Jul 2009
Posts: 3,635
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From: Lansdale, PA
I have bought a '93 5.8 with the wiring loom and computer. BUT, it's all from a left hand drive F-truck so I guess I'm going to have some problems fitting etc and firewall sockets and later instrumentation I don't have. Also the wiring loom is meant for the E4OD? transmission. Is there any way I can get the existing 302 computer re programed to drive the 5.8 with the existing loom? Not too worried about all the EGR as the vehicle is fitted out with LPG and uses this 99% of the time.
Thanks,
Phill. QLD
Thanks,
Phill. QLD
The 302 wiring will work just fine. And as long as you use a 351 computer for the same transmission you have, you won't need to rewire anything.
Typically you never use any wiring from the donor vehicle.
The 302 and 5.8 are essentially the same thing. Ones just a bigger brother and has wider intake. The accessories and engine mounts and transmission all interchange, but flywheel or flex plate is different because of balancing difference.
More than likely, the 302 computer will run the 5.8 just fine. But I'm pretty sure with LPG they just alter the timing and nothing more. So a 351 computer should work.
Logistics Pro
Joined: Jul 2009
Posts: 3,635
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From: Lansdale, PA
The 351/5.8 and the 302/5.0 wiring is exactly the same.
The only difference is the 302 has a knock sensor. You don't need to do anything with the wiring, just leave it alone and plug the 5.8 computer in and you're done.
Elder User
Joined: Oct 2008
Posts: 524
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From: Mesa, AZ
Both motors use the same heads so the ones you have will bolt right on after you bore out the main bolt holes to 1/2"(the 302 used 7/16" head bolts). However, the intake, distributor, oilpan, and timing cover are all unique to the 5.8 and those parts will not transfer from the 5.0, so you're probably gonna need a complete 5.8 EFI anyway. You will also need a 28oz flexplate or flywheel for whatever transmission you have, the 5.0 version is 50oz, and also a 5.8 computer that matches your trans. If the truck has a manual or C6 auto you have more computer options as either version will work since neither are computer controlled. If however the truck has an E4OD then you need a 5.8 computer for that trans only. With the correct computer no other wiring changes are necessary, all the sensors and actuators are in the same place on both motors so it will plug right in. The only other thing that has to be addressed is the exhaust, the 5.8 block is taller and wider so the Y pipe has to be widened.. if so equipped.
Boom http://www.summitracing.com/parts/at...view/make/ford
Also I found this for future reference for you guys running AODs http://www.clickclickracing.com/foru...u-want-to-know
Elder User
Joined: Jul 2004
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Just to add, the Harmonic Balancer needs to be for the 5.8 they're different. The timing cover WILL work. Fan belt will be short.
Mark the flex plate and balancer as to what they are. Easy to mix them up. Also there is a flex plate for the C6/E4OD that is different than the AOD/AODE/4R70W.
Mark the flex plate and balancer as to what they are. Easy to mix them up. Also there is a flex plate for the C6/E4OD that is different than the AOD/AODE/4R70W.
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