302 351 interchangeability
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302 351 interchangeability
Sorry, that makes no sense. How about this? My 302 in my 95 f250 gave out. Cracked cylinder bore, eaten-up crank and other broken components. I would like to replace it with a 351. I want more power of course. Would my existing computer work for a 351? How about all the connectors? I understand that the firing order is the same between the two engines.
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Yes it has mass air. Will all of the connectors plug right in or will a few mods be necessary? Also, I'm not interested in going to extreme performance levels with my work truck, but any cheap, simple ways to boost performance would be helpful. I would change the cam and intake plenums, particular interest in ford upper intakes. Not interested in tearing apart bottom end.
Thanks for any input
Thanks for any input
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From: Diboll, Tx.
If your going to the 351 it's plug and play mass air or not, since the mass air sensor is in the breather. The 351 and 302 were available without mass air on manual transmission trucks. You really dont need to do any performance mods. The fuel injected 351 is a powerful motor that i think you will not be disappointed in.
FTE Legend
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From: Ottawa, Ontario
You're laughin then, it's nearly a direct plugin as long as you are have a complete 5.8EFI motor oilpan to throttlebody. Best thing you could do would be a cam upgrade, if you get a '94 plus roller motor swap in something like the Crane Truck Power 444215 and forget about it. The 5.8 motor is wider than the 5.0 so some exhaust work will be needed, and you also need a 28oz flywheel/flexplate for whatever tranny you have.
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From: Diboll, Tx.
Just bolt a set of headers on the 351. With a high flow cat and muffler, you will get the same results without the hassel of doing a cam swap. Plus it will sound a lot better. I would also add a throttle body spacer. You can do the cam swap if you like, but remember, adding a bigger cam wont do any good if the engine cant breathe.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
And you were doing so well.
As a performance part this jewel ranks right up there with a "Turbo" decal for your fender. Please don't go there.
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What year did they start the MAF on the 351? IS the roller cam really better for stock duty or does it only shine with various performance upgrades. I would like a roller, but that does not mean that I can find one easily for the right price. What would be the best vehicle to find one in? Plenty of older 5.8's but with out Mass Air. Is there a place to find detailed info on the changes over the years? Thanks for the feedback it is quite helpful.
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
What year did they start the MAF on the 351? IS the roller cam really better for stock duty or does it only shine with various performance upgrades. I would like a roller, but that does not mean that I can find one easily for the right price. What would be the best vehicle to find one in? Plenty of older 5.8's but with out Mass Air. Is there a place to find detailed info on the changes over the years? Thanks for the feedback it is quite helpful.
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From: Diboll, Tx.
If you have been around speed shops as long as i have you would know adding a throttle body spaced is like adding a carb spacer. You will pick up an few extra ponies, and also pick up some low end torque. I used them before with very good dyno proven results. Now on the other hand, dont fall for the "swirl port" throttle body spacers. Those ARE a waste of time, money and have been proven to hurt performance and fuel mileage. A good free flowing exhaust system CAN get you very respectable gains in power and torque, but this too is a double edged sword, too small diameter exhaust will rob the top end, too large will have great top end, but rob your lower end torque. 2.5 inch seems to work very well for the 351 engines. Yes you Can get the same results if you dont just throw random parts on your Vehicle. Have a plan for what you want to do, and i cant stress this enough....research research research. It will pay off in the end.
FTE Legend
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From: Ottawa, Ontario
A throttlebody spacer will only provide similar results to a carb spacer when the motor uses throttle body injection. In both these cases the intake is considered wet, and the spacer is designed to help keep the fuel in suspension inside the intake.
On a tuned runner mulipoint EFI system like these trucks have the TB is 15" away from the injectors at the other end of the intake runners. The injectors shoot at the back of the intake valves so the intake is dry, anything happening at the throttlebody has no effect on fuel suspension and therefore a TB spacer simply won't make any difference.
Elder User
Joined: Feb 2007
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From: Madison Ohio
Just one question here. What about a 88 F150 with a 302? Can I put a 351W under the hood here and not have to change computer? Its a 302 with a AOD that I would like to change to a 351 and a ZF.
Thanks,
Thanks,
Fleet Mechanic
Joined: Mar 2005
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From: St Louis
In your case you will have to swap out the computer, as the SD system doesn't adjust too well to the size difference of a 302 and 351.