351 w interchange questions
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351 w interchange questions
I have a 1986 f150 with the 351w H.O. engine. Engine is bad and I need another. I have found a later 1996 351w injected motor. Can I use this and remove the injection set up and use my carburation system on the it?
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From: Virginia
I have done this with a 302. I see no reason why you could not do it also with a 351w. Make sure you keep the old engine, you will need a few things off of it. I would go ahead also and get a full engine gasket set(cheaper for a full set, try ebay) and then pull the front of the engine down and the oil pan. Put a new timing chain and new gaskets on everything before putting it in place. You get a set of head gaskets but you won't need them.
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From: Northeast, OK
The injected engine may not have a spot for the mechanical fuel pump. And, even if it does it may not have the eccentric to drive the pump. I don't know that it doesn't, but it might not. If it doesn't have the hole in the casting you'll have to go to an electric fuel pump. If it has the hole and no eccentric you can add that.
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From: Ottawa, Ontario
There is one other thing, the '96 will have a roller cam so the distributor drive gear from the EFI distributor has to be transferred to the dizzy from the old motor.. which you will then use in the newer motor.
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From: Northeast, OK
It won't.
NO, he just has to swap on the timing cover and eccentric from the old motor.
There is one other thing, the '96 will have a roller cam so the distributor drive gear from the EFI distributor has to be transferred to the dizzy from the old motor.. which you will then use in the newer motor.
NO, he just has to swap on the timing cover and eccentric from the old motor.
There is one other thing, the '96 will have a roller cam so the distributor drive gear from the EFI distributor has to be transferred to the dizzy from the old motor.. which you will then use in the newer motor.
I forgot the W's have the fuel pump bolting to the timing cover rather than the block. 
More Turbo
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The serpentine drive on the '96 engine will have a reverse rotation water pump so both the pump and timing cover will be different. Unless you are able to swap the entire serpentine drive into your truck you'll have to change it too. Otherwise the long block assembly is the same.
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From: Virginia
Do what I did on the 302. Swap the timing cover from the older engine, I had to drill the alignment dowels out to 1/2" to fit the larger dowels in the later block. I then used the older style waterpump, mechanical fuel pump, and the old v-belt system from the older engine. It all fit. I was careful about the timing pointer. It needs to stay where it is if you use the later harmonic balancer. If you have to move it because of the older timing cover, then you had better use the older harmonic balancer.
Most timing chains need to be replaced by now, so you will be in there anyway.
Most timing chains need to be replaced by now, so you will be in there anyway.
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The OP will also need the computer from whatever vehicle the engine comes from.
If the original computer is used, the truck will run just awful, in fact...it may not run at all.
If the original computer is used, the truck will run just awful, in fact...it may not run at all.
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From: Virginia
Back in the day it was cheaper to get a lower mileage later engine and swap it in, rather than pay for the machine work for a rebuild. Maybe he still found a good later engine, but all of them are getting wore out by now.
That's the reason I did it, the later 302 I got did not need a rebore like the original engine did. Back then a rebore was $80 per hole. I don't know what it is now.
That's the reason I did it, the later 302 I got did not need a rebore like the original engine did. Back then a rebore was $80 per hole. I don't know what it is now.
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From: Virginia
If you mess around in this link you will find Dorman 635-102 timing cover fits the 302 as well as the 351w. I think the oil pans are different. I know the dist's are different, the hex shaft that drives the oil pump is larger on the 351w
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