engine swap question

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Sep 19, 2003 | 12:23 PM

RyanB

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Joined: May 2003

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From: Stanwood, WA

engine swap question

I have two trucks,1990 F-150 with a good 351 engine auto trans, bad body, a 1988 f-150 with a bad 302 5 spd manuel trans and good body, both are 4x4. Can I just swap motors and fly wheels and it will start and run, or is the computer/efi completely different on these two trucks? Anything else that would give an unforeseen head ache? Any words of wisedom? Thanx

Sep 19, 2003 | 08:16 PM

ecarter50

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Joined: Jun 2000

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engine swap question

351 will run with 302 computer. Which auto trans do you have? If it is c6 or non-electronic AOD I would swap 351 comp also. Do not use 82-later 302 flywheel/flexplate on a 351. They look the same but are balanced different. You need a flywheel from a 351w or 81-earlier 302. 82-later 302 have 50oz imbalance. 351w and 81-earlier 302 have 28oz imbalance.

Sep 19, 2003 | 08:53 PM

fordtrks4fr

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engine swap question

a guy never would have figured the flywheels, how do u tell them apart first glance?

Sep 20, 2003 | 04:25 PM

fordtrks4fr

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engine swap question

part # that is? sorry. is the weight the only way?

Sep 20, 2003 | 08:11 PM

ecarter50

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engine swap question

The 50oz weight is much larger if you have both together.

Sep 20, 2003 | 09:19 PM

Airbrush

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Joined: Apr 2003

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From: Fl

engine swap question

Firing order for 5.0 HO, 5.8 is 1-3-7-2-6-5-4-8

For 5.0 Non-HO it is 1-5-4-2-6-3-7-8

Should check to see which you have in the 302 truck, you may need a mustang computer.

Sep 21, 2003 | 12:06 PM

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

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From: Concord, NC

engine swap question

Trucks have batch fire injection, meaning 4 injectors fire at a time, so firing order shouldn't have any effect on the computer. A mustang computer would require way too much wiring modification to be considered worthwhile for just a simple engine swap. I would use the stock computer (302) with the 351, and if that doesn't work, then you can do something different. There's no need to go through swapping computers if you don't have to.

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Sep 24, 2003 | 11:06 PM

fordtrks4fr

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Joined: Aug 2003

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engine swap question

take everything that is 351 that isnt 302 and drop the whole thing in there, like the exhaust and complete motor upper intake to oilpan. wiring harness should hook right up. you might not be planning it but, if a guy wants to swap trans also u will need to take everything from that too like kickdown cable, and run vacuum to the modulator. been a while and am still learning about this but i think the trans will bolt to the trans case at the same length with out moving things or swapping driveshafts? i/d ask around. u will also have to change the column or install a aftermkt floor shift with cable, i think they fit 4x4 if u run a cable unit.. what do these years have the aod or did they still have the c6?

Last edited by fordtrks4fr; Sep 24, 2003 at 11:09 PM.