302 to 250 swap/ plus tranny.

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302 to 250 swap/ plus tranny.

Post #1 by Invectivus » Sun Jul 16, 2017 12:19 am

So, my bronco has a v8 with a smoking problem. Probably, maybe. Anyway, I was considering building up one of my 250s and transplanting it in. Recognizing the different sump pan needed, I have three main questions:
1. Will a 250 tow a camper trailer better than a 302, or vice versa, recognizing you can cam both for hauling.
2. I hear there are different core/radiator supports between straight and bent engines. What's up with that and is it a concern?
3. I want a great auto, it's a c4 now. What are the good auto tranny's for towing?

I plan on efi either way, for mountainous driving comfort.
1967 mustang coupe - 200ci, 69 dizzy, adjustable rockers, headers and dual exhaust, T5.

1964 convertible falcon - Gutted.

1973 EB Bronco - 302ci (sorry!) DUI ignition, C4/D20, Dana 44, 33's

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Re: 302 to 250 swap/ plus tranny.

Post #2 by jimmyv65 » Tue Jul 25, 2017 8:23 pm


Not a lot of traffic out here this summer. Sorry you aren't getting feedback. I can't speak to towing much, but will add this.

My 250 with FI feels strong enough to tow. With a carb it did not. I seem to be a lone voice on this, but the 2bbl adapter plate is a horrible thing. It puts the float bowls sideways. That caused me all kinds of issues. So, stay EFI.

Have you considered the 300? In hindsight, I would have gone with the 300. You can get an already efi'd 300 pretty cheap from a mid-90's F150. They had a decent factory auto and I am sure were used to tow a bunch.
1966 Bronco-'78 250-Meagsquirted TBI, DUI, Header, Cam, Hydroboost & Front Disc, Uncut, 1" body lift, 2.0" suspension lift

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Re: 302 to 250 swap/ plus tranny.

Post #3 by bmbm40 » Tue Jul 25, 2017 8:36 pm

I would definitely stick with the 302 and use a torque cam with a rebuild. If I had a v8 Bronco I would want an aod/aode or similar 4 spd auto. As you know your tire size and gearing will be a factor. In my opinion the 302 rebuild will be way easier and cheaper.
66 Bronco-1970 250, NV3550, DSII, 4 turn ps, uncut, 1" bl, 2.5" sl, front disc, twin stick D 20, 30 x 9.50
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'81 F150 4x4 300

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