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Old 06-21-2005, 12:51 PM   #1
Gbronco1
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How much hp on a stock 302?

I was just wondering how many hp is expected out of a rebuilt 302 (assuming stock). I wanted to rebuilt my 302 with very mild modifications to increase hp. I have been told to go 351 but many other tell me is not really that much of a difference and plus it would cost me about the same to get a used 351 and to rebuild my 302 with mild modifications. My mechanic tells me that stock the 351 and the 302 is about 20hp difference, true?. Well, I hope I have made the right decision by going the 302 route. The only thing is what I ask first, how many hp, assuming stock without any mods?

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Old 06-21-2005, 01:03 PM   #2
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I think it's only 180-190hp for a 302. It's not much. I think the 351 topped out at like 225-235. You could definately make up that difference with a good set of heads, cam, intake, exhaust.

I'd personally go with a 351.
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Old 06-21-2005, 01:29 PM   #3
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The Gosphel according to Chilton's
Engine Displacement Fuel System Net HP@RPM Net Torque@RPM (ft. lbs)
1988 5.0L (4942cc) MFI 185@3800 270@2400
1988 5.8L (5766cc) MFI 210@3800 315@2800

These specs are the same from 1987 to 1991
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Old 06-21-2005, 01:32 PM   #4
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Well that post didn't come out as structured as I hoped. Categories didn't quite line up but I think you get the idea
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Old 06-21-2005, 01:46 PM   #5
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Yes, I get the idea. I feel that if I go with the 302 eventhough it will be freshly rebuilt I will regret it. I guess I will just follow the crowd and go 351 too. I know it will be used and do not know how much it will last but well it can always be rebuilt.

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Old 06-21-2005, 01:46 PM   #6
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You have to remember that a 351 starts with more hp and torque and with small modifications will increase that.
In other words if you do the same to the 351 as you do to the 302, the 351 will always have more hp and torque.
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Old 06-21-2005, 02:00 PM   #7
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Originally Posted by k1w1t1m
You have to remember that a 351 starts with more hp and torque and with small modifications will increase that.
In other words if you do the same to the 351 as you do to the 302, the 351 will always have more hp and torque.
Then why do people keep their 302s? I have a 302 and it isn't worth shit.
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Old 06-21-2005, 02:30 PM   #8
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I like my 302. Pushes the bronco quite nicely, and has beat up on a few chevies. Even one where the kid said it was a "built" 350. Well it was built, built in a factory somewhere, lol.
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Old 06-21-2005, 02:32 PM   #9
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Then why do people keep their 302s? I have a 302 and it isn't worth shit.
You think yours is bad? Come drive mine around for a day! The only way I can get up to 65mph is going down hill.
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Old 06-21-2005, 02:41 PM   #10
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my 302 has good power, outran my friends pathfinder when we were racing, it has a lot of grunt to it. maybe if i HAD to get a new motor, i might would go with a 351, but a 302 moves my truck just fine
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Old 06-21-2005, 02:50 PM   #11
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Then why do people keep their 302s? I have a 302 and it isn't worth shit.
Possibly because yours is over 20 years old
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Old 06-21-2005, 03:13 PM   #12
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I wish I had gone with a 351 even after all the work that has gone into my 302. *now a brand new engine with a cam and head work.*
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Usually if you pull out and then stick it back in there you can keep pumping without problems.
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Old 06-21-2005, 03:21 PM   #13
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Possibly because yours is over 20 years old
True.
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Old 06-21-2005, 03:28 PM   #14
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I think the durability of the 302 makes up any difference. I mean shit i see stangs with 300,000 to 400,000 miles on them. I know a girl who forgets to check her oil and rags the hell out of her 302 and it is 290,000 miles on it and never rebuilt. IMHO one of the best motors ford built, first being the 6 cylinder 4.0, but opinions are like a$$holes, everyones got one

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Old 06-21-2005, 07:46 PM   #15
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Gbronco1

I love my 5.0 and have done a lot to help it along. She'll flatten the needle against the trip meter no trouble and gets there very quickly and still throws down 17-19mpg no trouble (driving like an @$$).

That said, it's torque that wins street races, not horsepower. It's even more true and critical in heavy trucks, like ours. A 351 starts out with a more advantageous longer stroke and anything you do to a 351 is going to net you more torque than if you'd done it to a 302.

Also they have very similar rebuilding costs, so why not go 351 ?

Two more cents from a 5.0 owner

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Old 06-21-2005, 08:10 PM   #16
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I think the 351 block itself is a better foundation if you ever decide to upgrade in the future. That along with everything else that has always that has already been said should be enough for you to make decision.
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Old 06-21-2005, 08:28 PM   #17
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3" mains + better block + more torque & horsepower > 2.249" 302 mains + weak block + less torque & horsepower
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Old 06-21-2005, 10:35 PM   #18
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I used to have an '80 with a 351M and thought it was a beast, even with 32s and 3.55s. I was always very happy with the power it had.

Then I got the '90 I have now and started reading about how the 5.0L was such a dog. That made me wish I had that old 351 back. Recently I found out that the EFI 5.0L makes more that 40HP and about 10ft/lbs *more* than the 351M. And it generally runs better and gets better MPG to boot.

Now I don't feel so underpriviledged anymore.

Here's the engine specs for the various FS Bronco engines, 1978-'96:

http://www3.telus.net/cbradley/Engin...fications.html
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Old 06-21-2005, 11:01 PM   #19
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only thing good about the 351m is the fact that you don't have to swap the tranny to put in a 429/460
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Old 06-21-2005, 11:13 PM   #20
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Quote:
Originally Posted by dmk
I used to have an '80 with a 351M and thought it was a beast, even with 32s and 3.55s. I was always very happy with the power it had.

Then I got the '90 I have now and started reading about how the 5.0L was such a dog. That made me wish I had that old 351 back. Recently I found out that the EFI 5.0L makes more that 40HP and about 10ft/lbs *more* than the 351M. And it generally runs better and gets better MPG to boot.

Now I don't feel so underpriviledged anymore.

Here's the engine specs for the various FS Bronco engines, 1978-'96:

http://www3.telus.net/cbradley/Engin...fications.html
Too true dmk

A 351 M is not as blessed with new tech as the 5.0 and Windsor 5.8. You also can't have a 4 spd OD auto, so mileage would never be even close to the newer engines.

The last 351 M rolled off the line 24 model years ago and nobody in the aftermarket is busting their humps inventing new parts for them.

They weren't beloved engines when they were new, being dismissed as smog motors, and unless you do a lot of mods to them their mileage is abysmal and the performance ain't stellar either.

Derrick put it best by mentioning it's best attribute; it's a good platform for a 460 swap.

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