1986 300 I-6 to V8 swap - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-04-2000, 11:41 AM
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1986 300 I-6 to V8 swap

I am planning on swapping a 351W into my 1986 Bronco that currnetly has a 300 I-6 with a 4 speed manual. What will I need to do this swap? Are the bell housing bolt patterns the same? How about motormounts? What if I decided to do a 400M instead of a 351W?

1980 Bronco with a crack so big in the dash the Grand Canyon is Jealous
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post #2 of (permalink) Old 05-04-2000, 01:56 PM
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Re: 1986 300 I-6 to V8 swap

the 400 is a modified and will not bolt up to a 351w... you will have to replace the tranny and who knows what else... the 300 is a winsdor so the 351w should match up better. motor mounts are a different deal though

headers on a 6 banger
post #3 of (permalink) Old 05-04-2000, 02:30 PM
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Re: 1986 300 I-6 to V8 swap

you will also need to pick up a radiator out of a V-8 truck. The inlet/outlet are on opposite sides and will cause a problem for hose routing. You will need the accessory brackets off the V-* engine as well.

If it ain't broke, I can probably still fix it.
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post #4 of (permalink) Old 05-04-2000, 08:37 PM
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Re: 1986 300 I-6 to V8 swap

I once put a 300I-6 into a 79 ford truck that had a 400M in it originally. Most of the mounting points were on the frame but all the brackets had to be changed. The motor mounts just unbolted and the I-6 mounts bolted in perfectly. Even the tranny crossmember bolted right up. The truck had a auto tranny which we scraped and replaced with a 4 speed manual. Aside from the different length there was no problem, the holes were in the frame and not used with the auto so it was only a matter of bolting the crossmember up in the right holes. In this case I used everything from the motor to the rear end so drive shafts and such matched right up. This was a 79 Twowheel drive but from what I have seen they did this wih many of the truks so if you are swapping in something that was optional you should be able to bolt it right up.
Good luck and if you can find all the parts you need at th salvage yard you will probably be golden.

[img]/wwwthreads_images/icons/wink.gif[/img]If it's stuck, force it! If it break's,it needed replacing anyway!!!
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