302 to 351w swap

SlowJoe · 10-14-2010, 02:42 PM

i am swapping a 351w in my 87 f150. i have searched and it seems like i will have to chip my ecm to make it run right. does anyone know for sure? should i get the ecm out of the 93 that the engine came from? it was a auto and mine is a 4 speed. thanks

Italian LX · 10-17-2010, 06:14 AM

Quote:

Originally Posted by joecoupe

i am swapping a 351w in my 87 f150. i have searched and it seems like i will have to chip my ecm to make it run right. does anyone know for sure?

Not sure if the '87 F150 has an SEFI motor, but if it does, you would definitely need to swap the ECU. The 351W uses the 302HO firing order and your truck 302 (and ECU) would use a non-HO firing order.

I'm not real familiar with the wiring and workings of the truck motor's fuel injection system, but their could be a lot of other things that become an issue too. Things like different wiring pin-outs between the ECU's, MAF curves, and load calculations (due to larger displacement).

Maybe someone else that has done this swap can give some more info.

EHardy1971 · 10-17-2010, 07:33 AM

Same basic setup, so the ECU from the '93 would work. I've heard some people say that the earlier (pre-'89) trucks had batch fire, but my best advice is to grab the engine harness too while you're at it just to be on the safe side. I know Ford loved to change crap on these trucks mid-year for no apparent reason. Example, mine is an early build '95, and uses different wheel seals, and a few other parts from the trucks with a build date of 5/'95 and up.

SlowJoe · 10-17-2010, 06:40 PM

i know they have the same upper intake. the swap is not that big of deal but dont think the ecm will run it good.

EHardy1971 · 10-18-2010, 03:31 AM

Quote:

Originally Posted by joecoupe

i know they have the same upper intake. the swap is not that big of deal but dont think the ecm will run it good.

It's the same engine altogether until '95. That's when the 302's in the trucks went to the 351/H.O. firing order. Just swap the computer and you should be good.

SlowJoe · 12-06-2010, 08:23 PM

well my truck wires up 15426378 and the windsor wires 13726548. so looks like i will have to do the ecu swap.

93cobra1928 · 12-07-2010, 05:05 AM

You could just swap cams...

Edit- Nevermind, it's way too early to think clearly

EHardy1971 · 12-07-2010, 08:49 AM

Quote:

Originally Posted by joecoupe

well my truck wires up 15426378 and the windsor wires 13726548. so looks like i will have to do the ecu swap.

Quote:

Originally Posted by 93cobra1928

You could just swap cams...

Edit- Nevermind, it's way too early to think clearly

QWKSNKE · 12-07-2010, 10:06 AM

Quote:

Originally Posted by 93cobra1928

You could just swap cams...

Edit- Nevermind, it's way too early to think clearly

No you were somewhat correct. ECU does not control the firing order. Just reroute the wires to a 351 order and it should work

TheJeanyus · 12-07-2010, 10:07 AM

Quote:

Originally Posted by QWKSNKE

ECU does not control the firing order.

That's what I was thinking. All that controls the firing order is the way it's wired, right?

10-14-2010, 02:42 PM	#1
SlowJoe Mind Blowing Join Date: Jun 2006 Location: Dawsonville Ga Posts: 3,913	302 to 351w swap i am swapping a 351w in my 87 f150. i have searched and it seems like i will have to chip my ecm to make it run right. does anyone know for sure? should i get the ecm out of the 93 that the engine came from? it was a auto and mine is a 4 speed. thanks __________________ Slow Joe Racing 2008 dodge ram 5.7 HEMI 1993 lx with a 289 and a 3 speed on the floor WTB 1955 t-bird project

10-17-2010, 07:33 AM	#3
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	Same basic setup, so the ECU from the '93 would work. I've heard some people say that the earlier (pre-'89) trucks had batch fire, but my best advice is to grab the engine harness too while you're at it just to be on the safe side. I know Ford loved to change crap on these trucks mid-year for no apparent reason. Example, mine is an early build '95, and uses different wheel seals, and a few other parts from the trucks with a build date of 5/'95 and up. __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS Last edited by EHardy1971; 10-17-2010 at 07:38 AM.

10-17-2010, 06:40 PM	#4
SlowJoe Mind Blowing Join Date: Jun 2006 Location: Dawsonville Ga Posts: 3,913	i know they have the same upper intake. the swap is not that big of deal but dont think the ecm will run it good. __________________ Slow Joe Racing 2008 dodge ram 5.7 HEMI 1993 lx with a 289 and a 3 speed on the floor WTB 1955 t-bird project

12-06-2010, 08:23 PM	#6
SlowJoe Mind Blowing Join Date: Jun 2006 Location: Dawsonville Ga Posts: 3,913	well my truck wires up 15426378 and the windsor wires 13726548. so looks like i will have to do the ecu swap. __________________ Slow Joe Racing 2008 dodge ram 5.7 HEMI 1993 lx with a 289 and a 3 speed on the floor WTB 1955 t-bird project

12-07-2010, 05:05 AM	#7
93cobra1928 Dazed and Confused Join Date: Mar 2009 Location: Northport, Al Posts: 778	You could just swap cams... Edit- Nevermind, it's way too early to think clearly __________________ Proud owner of 93 Cobra #1928 306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards Last edited by 93cobra1928; 12-07-2010 at 05:08 AM.