Pros & cons 331 vs. 347 stroker - Vintage Mustang Forums

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post #1 of 33 (permalink) Old 09-24-2007, 07:13 PM Thread Starter
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I'm curious what the differences are, besides the obvious displacement, in the 331 and the 347 strokers. What are the pros and cons of each? I overheard someone mention that 347's use oil quite a bit...any truth?


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post #2 of 33 (permalink) Old 09-24-2007, 07:31 PM
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Quote:
Originally Posted by blu67
I overheard someone mention that 347's use oil quite a bit...any truth?
Yep, that was true...in 2000. Since then, most 347 kits use pistons that keep the pin out of the rings, so no more chronic oil burning.

Unless you have a specific reason NOT to build a 347, I'd go for it!

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post #3 of 33 (permalink) Old 09-24-2007, 08:43 PM
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Isn't a 347 basically a 331 with +.030 pistons?
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post #4 of 33 (permalink) Old 09-24-2007, 08:47 PM
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Quote:
Originally Posted by Outlawboss
Isn't a 347 basically a 331 with +.030 pistons?
Nope, it's a 3.4" stroke Vs. a 3.25" stroke. For comparison, a 351W is a 3.5" stroke.

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post #5 of 33 (permalink) Old 09-25-2007, 03:05 AM
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The biggest con to using a 331 is you don't have a 347

I suppose I'm slightly biased...
But personally I blame the extra torque and compression :p
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post #6 of 33 (permalink) Old 09-25-2007, 07:23 AM
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Rod angle.
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post #7 of 33 (permalink) Old 09-25-2007, 10:21 AM
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Chris,
I am pondering the same question for Shag. Are you going to have a engine stroked or are you considering a stroked crate engine? Aluminum heads?





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post #8 of 33 (permalink) Old 09-25-2007, 02:02 PM
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I'd personally stick with a 331. If you want larger step up to a 351 block. That would be your best bet anyways IMO.

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post #9 of 33 (permalink) Old 09-25-2007, 03:33 PM Thread Starter
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Well, Craig....I'm picking up a used 5.0 rollerblock this weekend. I would like to put aluminum heads on and will keep the aluminum intake and Holley carb I currently have. I have just heard quite a few guys here talk about the 347 stroker kits and was curious at the differences.


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post #10 of 33 (permalink) Old 09-25-2007, 03:45 PM
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This might clarify Jim's response to the worries of rod angle. http://www.fordmuscle.com/archives/2...ker/index2.php

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post #11 of 33 (permalink) Old 09-25-2007, 03:52 PM
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When I did my 331 I did so because of the rod ratio. The 331's ratio is more conducive with longevity. If you want to race and rebuild go 347.

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post #12 of 33 (permalink) Old 09-25-2007, 03:59 PM
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Quote:
Originally Posted by buening
This might clarify Jim's response to the worries of rod angle. http://www.fordmuscle.com/archives/2...ker/index2.php
Yes, thanks.
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post #13 of 33 (permalink) Old 09-25-2007, 04:08 PM Thread Starter
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Quote:
Originally Posted by kechke
When I did my 331 I did so because of the rod ratio. The 331's ratio is more conducive with longevity. If you want to race and rebuild go 347.
This actually answers my question. Longevity and maintenance is important and it looks like a 331 is better than stock and maybe not a good as a 347 in some areas but better for longer life of the engine.


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post #14 of 33 (permalink) Old 09-25-2007, 05:00 PM
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That article is very imformative. The old dog learned something new.


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post #15 of 33 (permalink) Old 09-25-2007, 11:21 PM
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I can't speak from personal experience, meaning I haven't built both and directly compared them, but from what I have read from some of the most knowledgeable Ford builders out there, the ONLY reasons to build a 331 vs. a 347 is if you are restricted by some class rules for the racing you are doing, or if for whatever reason you just want less power. That is it.




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