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Old 04-07-2013, 07:22 PM
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5.0 Speed Density to 5.8 Mass Air Flow Conversion

So I pulled the 5.0 from my truck (1987 F150 ECSB) a while back and was going to do some work on it, clean it up, and put it back in with a new cam, headers, maybe some GT40 heads, etc. Mild stuff. But i figured today, that if i am after more power, and planning on spending money anyways, why not just swap in a 351 and convert it to mass air at the same time? Shouldnt be too terribly hard I dont think.

The main thing right now is this. Will the 351 bolt in place of my 302? same motor mounts, same transmission, etc? What about the engine accessories? Will they transfer from the 302 to the 351?

And finally what about the engine harness. Can I get a harness from a 94-95 MAF truck... 5.0 or 5.8 and use it for the 5.8... or does it have to be 5.8 specific? I was thinking they were the same... probably need a harness from a 5 speed truck since my truck has an AOD and the 94-94s would be AODE or something else. What do you all think?

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Old 04-07-2013, 08:22 PM
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Get a donor vehicle with the engine.
The accesories brackets are all different . The 351 deck height is taller, spreading the heads farther apart hence the acc brackets wont fit by about 1/2 an inch.
Wiring harness will be different as will the PCM the MAF is also SFI on that ,not batch fire like standard 5.0
tons of work and parts.
IIRC the 351 is externally balanced and so the flex plate /flywheel will be different.
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