5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

5.0 swap....

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Old 01-15-2009, 07:51 PM
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BUGSY 5.0
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Question 5.0 swap....

hey guys what's goin on? i just wanted to ask a ? about my car. well i have a '86 notch with a 3.8l v6 (TBI) and i want to put a 5.0 engine that i have it's carb so by any chance how would i run this motor since it's carb? and my car is TBI and if so do i have to bypass the return line for the fuel and anything else i would have to do so i can run this engine? THANKS!!!!
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Old 01-15-2009, 08:07 PM
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Detroit Style
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You will need a fuel pump for a carbed motor, eliminate the return line, run a non-ecu controlled dizzy/ignition set up. Past that, its just common sense v8 parts like, mounts, headers, etc.
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Old 01-15-2009, 08:11 PM
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so i wont be able to use my electric fuel pump?
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Old 01-15-2009, 08:38 PM
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Nope, you can replace it with a low pressure one though. EFI cars run much higher fuel pressures than a carbed car. Carbed cars tend to run up to 6psi tops for naturally aspirated set ups. EFI cars tend to run 30+ psi as a base setting.

Another option would be to, get a pick up for your tank, and run a mechanical pump, that is engine mounted.
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Old 01-15-2009, 09:41 PM
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mjr46
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personally I'd just run a manual pump
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Old 01-16-2009, 02:54 PM
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well the motor i have was oringinally a fuel injection engine out of an '88 gt, but i changed it over to carb so i would be able to run it on my '84 gt, but now i wanna put it in my '86 so the motor doesn't have an engine mounted pump...
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Old 01-17-2009, 12:27 PM
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Then you need to replace the intake pump with one that is made for a carbed motor.
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Old 01-17-2009, 07:07 PM
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You could run the one that came with the cfi you would just need an adjustable regulator with a return feed.

That CFI is something like 13psi.Not much different than the holley blue pump its just not been dead headed like the holley.For what a good mechanical or electric pump will cost you could just get the necessary regulator.

As for ignition nothing beats an old DURASPARK 2 setup and the entire setup can be had for 50 bucks at any auto parts store excluding the coil.The duraspark 2 is very reliable and easily tuned and recurved.

Other than that its just a simple swap from the 3.8 to the 5.0.For a mild 5.0 even the radiator if in good condition will be fine.
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Old 01-18-2009, 01:45 AM
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well where can i purchase an adjustable regulator and roughly how much?
how would i run the fuel line and the return line to the carb? i notice there is two lines that run to the CFI.

as for the duraspark do i have to modify anything or does it just bolt right in?
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