'85 351w plus SD EFI

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Aug 14, 2007 | 04:58 PM

bennyd

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From: Ceour d'Alene, ID

'85 351w plus SD EFI

I'm planning on swapping the worn-out 5.8 in my '91 F250 with a recently rebuilt long block from an '85 truck (carbed, of course).

Will the '85 cam mess with the '91 SD 'puter? Any other suggestions or advice?

-Ben

Aug 14, 2007 | 05:10 PM

87f1504x42001

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my uncle converted a 302 fuel injected to carburetor. and his truck wouldnt start, they unplugged the computer and it started right up. dont know why, but, it might be the same as far as your truck goes

Aug 16, 2007 | 01:29 PM

bennyd

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From: Ceour d'Alene, ID

What should I be sure to pull from my '91 block? Sensors & dizzy for sure, but will anything else give me trouble? Do I need to swap the cam?

Aug 16, 2007 | 03:01 PM

Conanski

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From: Ottawa, Ontario

Was the '85 a HO motor? If it was use the cam it has. If not swap it out for an aftermarket cam, the standard cam for the non HO 351(both EFI and carb) is lame. You'll need the complete EFI intake with all wiring and plumbing for the swap.

Aug 16, 2007 | 11:05 PM

albung

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From: youngstown ohio

you are just changing motor thatis carbed to ur truck with sd efi correct??? mite work with the cam mite not depends on lobe seperation

Dec 10, 2007 | 05:36 PM

bennyd

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From: Ceour d'Alene, ID

Just now getting around to the swap... :P

Yeah, the air cleaner shows that it's an HO, so I'll leave the cam in. Looks like I'm going to have to swap the timing cover too, the old one had a cam-driven fuel pump.

Thanks all...

Dec 10, 2007 | 10:21 PM

Conanski

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Quote:

Originally Posted by bennyd

Looks like I'm going to have to swap the timing cover too, the old one had a cam-driven fuel pump.

Blockoff plates are available to cap the timing cover....

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Dec 12, 2007 | 09:45 PM

Conanski

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From: Ottawa, Ontario

Quote:

Originally Posted by bennyd

How much better is the '86 HO's cam?

I think it'll run fine, and it'll produce WAY more power than the '91.

Dec 13, 2007 | 12:42 PM

#10

bennyd

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From: Ceour d'Alene, ID

Nice... you just made my day!

Just keep your fingers crossed that my poor little SD computer doesn't get too confused, I don't want to buy a chip for it ($$$).