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Old 03-06-2009, 07:55 PM   #1
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331 vs. 347

Looking for knowledge, and/ or opinions on both.
Why would one choose one, or the other?


Thanks.
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Old 03-06-2009, 10:54 PM   #2
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Re: 331 vs. 347

more cubes...more power its able to put down, why go smaller?
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Old 03-06-2009, 11:13 PM   #3
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Re: 331 vs. 347

Anderson Ford Motorsport Home Page
Some cams say 302, some 302-331, and others 302-347 which lead me to believe there may be pros and cons to each.
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Old 03-07-2009, 08:53 AM   #4
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Re: 331 vs. 347

Quote:
Originally Posted by Powerboat View Post
Anderson Ford Motorsport Home Page
Some cams say 302, some 302-331, and others 302-347 which lead me to believe there may be pros and cons to each.
The "larger" cams just work better with more displacement because you're moving more air.

I personally would go with a 331. In the past, there were a lot of problems with the fact that the oil rings intersected the wring pins on most 347 kits. Today, these problems are kinda non-existant. Still, a 347 is stretching the limits of a 302, and to me, that's just an unnecessary risk. I'd rather play it a little more safe with a 331, but it's all a matter of preference.

You will make more power, assuming all other components remain the same, with the 347.
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Old 03-07-2009, 09:55 AM   #5
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Re: 331 vs. 347

the wrist pin thing is more myth then anything. There are oem bore/stroke motors that have worse angles then the 347. if your spinning it to 7k+ or something then yea its not going to last as long but if your limiting to around 5500-6000 or so like a normal power band especially for a street/strip motor you will be just fine.

go over on corral an look up the subject.
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Old 03-07-2009, 10:47 AM   #6
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Re: 331 vs. 347

I wouldn't call it a myth.

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Old 03-07-2009, 12:52 PM   #7
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Re: 331 vs. 347

FWIW I had a 331 in the 92..

and it never lost power/wore out/etc ~8-10k miles on the motor, had zero issues and shifted at 62-6300 depending on weather, never burned oil either..

If I were to do it over again, I would again go with a 331..

I don't have scientific data/ etc and haven't owned a 347, it's just personal preference on my end..
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Old 03-07-2009, 06:23 PM   #8
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Re: 331 vs. 347

yes it physically does it..but doesnt hurt anything. look up other motor rod angles and **** aswell...the 347 will not be by far the worst either.
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Old 03-08-2009, 03:07 PM   #9
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Re: 331 vs. 347

I guess I didn't know there was a differance in the pistons.
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Old 03-08-2009, 07:00 PM   #10
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Re: 331 vs. 347

look/call around an whatnot...the problems have been solved with the pistons.

For the cost of stroking a 302, you could just do a 351W swap and have more displacement, a longer stroke, and altogether stronger engine (most especially, the block), and one that can make the same power at a lower RPM and can last longer. At 347 cubic inches, the 302 is just about tapped out, whereas a 351W can go as high as about 427 cubic inches with the factory block.
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Old 03-08-2009, 08:26 PM   #11
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Re: 331 vs. 347

I've thought about that.
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Old 03-14-2009, 11:17 AM   #12
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Re: 331 vs. 347

Topic #2. 347 vs 331

347 or larger, I was stupid, don't spend big bucks and leave power on the table... personally I would mind doing it over again with a custom 357 deal.
and if your still scared (or more importantly if your builder is scared) consider getting a better builder or just let them do the 5.315" rods 347 deal as it uses the exact same piston the 331 does.
personally any builder worth his salt will chuckle at this debate.
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Old 03-14-2009, 12:47 PM   #13
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Re: 331 vs. 347

A friend of mine just built a DSS 347, and he says there are guards protecting the oil rings. I would agree to stroke a 361 if I didn't already have a .030 over block. I'll probably buy the same kit he did, but with dish pistons since I'm planning on a blower.
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