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6-- V8 engine swap

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Old Apr 21, 2007 | 07:58 AM
  #1  
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6-- V8 engine swap

Ok, Heres the deal I have a 91 f-150 with the 6 banger that is 5 speed stick, also I have a 89 F150 with a V8 (5.0l) auto I would love to keep the stick and also use the V8. Is this marriage possible or are the bell housings different.
I am suspecting that it won't fit but asking anyways.
 
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Old Apr 21, 2007 | 08:49 AM
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Welcome to the forum

89 to 96 are pretty much the same trucks........grouped for many parts and add-ons in that range. Even the Haynes is.
I'm sure there were 91, 5.0's with a 5-speed behind them too. My guess is worst case you'll need an adapter to bolt it up because of the difference in trannys. I haven't done it but I'll bet others here have and will be able to answer you positively
 
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Old Apr 21, 2007 | 09:01 AM
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the I300 inline six and the 302/351W's have the same bellhousing.

It's a fairly easy swap, just use the correct manual tranny 302 flywheel and chage the wiring and the EEC when you swap it in.
 
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Old Apr 21, 2007 | 09:45 AM
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You will also need to change the motor mounts. 302 mounts are on the back side of the crossmember and 4.9 mounts sit on top of the crossmember.
 
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Old Apr 21, 2007 | 05:40 PM
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if you aren't done yet

if you aren't done yet you'll run into a few other things. the radiators are different but with you having both trucks sitting there that makes it so much easier. good luck. i done my 300 to 302 swap and i'm very happy with it!
 
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Old Apr 21, 2007 | 11:01 PM
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As everyone says, it will bolt up fine. However, I don't think you will be too happy with this swap - most people aren't.
 
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Old Apr 22, 2007 | 06:47 AM
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I am glad to hear that the swap will be fairly easy, but Andym, why do you think I wouldnt be happy ist it the gear ratios, Or something else, You feedback is great.
 
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Old Apr 22, 2007 | 10:29 AM
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i'll be honest man. i will have to agree that i wasn't happy at first cause i couldn't really tell the power difference but after a bottle of cfoam in the tank and a bottle down the intake and some exhaust work it was well worth my money...... no the 302 doesn't have the same tourque where you can lug the motor down low but hell give it more gas.... that's my theory.... and specially if you put some lower gears in it. i got a 3.50's with 35 inch tires and it's a little doggy but for a stock 302 and those gears and tires i think it does pretty good really. i do have a set 4.56s to make it more of a trail crawler though cause with a 5 speed and the huge tires it's really high geared.
 
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Old Apr 22, 2007 | 10:55 AM
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because the 300 six is a better engine in these trucks.
 
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Old Apr 22, 2007 | 11:01 AM
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Originally Posted by quicklook2
because the 300 six is a better engine in these trucks.
that's all in a personal prefrence. i liked it but i like my 302 better and if it goes i'm going to go 351 or 460 the next time cause i got ***** and they tell me bigger is always better!
 
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Old Apr 22, 2007 | 11:35 AM
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i will rephrase, the 300 six is a better all around engine in these trucks imho.
 
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Old Apr 22, 2007 | 12:00 PM
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The I300 is a large bore, large rod inline six. By design it produces most of it's torque at lower RPMs.

The 302 produces most of it's power in the mid RPM range.

Since trucks are heavy, and the gearing is what it is, generally you want the engine to make it's peak torque much lower than you would in a lighter car.

Of course one can change the gearing and rev the snot out of the 302 to accomplish the same thing, however you're wasting gasoline to do so.

But to each their own.
 
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Old Apr 22, 2007 | 12:21 PM
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frederic, very well said.
 
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Old Apr 22, 2007 | 03:09 PM
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Thanks again
 
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Old Apr 22, 2007 | 05:39 PM
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A little bit of devil's advocate for the 302 bias here. The 300 I6 is a wonderful, pull till she dies up to about 70-80 kms. Unfortunately, since it was deemed by the aftermarket as not a decent hot rod motor, the amount of aftermarket for this motor is like a drop in the ocean. The 302, as well as the other windsor based motors, have a huge amount of aftermarket parts and accessories to taylor the 302 to a more variety of vehicles. There is still no replacement for displacement, and longer stroke is a major factor in torque output, and the 302 will never win any tractor pull contests in a full size rig without extreme gearing when compared to larger engines, but with the right mods it can out perform a 300 I6. Its all just a matter of how much you want to spend.
 
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