331 vs 347

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Lynx331

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Jan 5, 2004

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Jul 24, 2005

#1

• Jul 24, 2005

• #1

Well guys... the winter is fast approaching.. and i want to have everything planned, exactly what im gona do and how im gona do it. Im really considering a stroker kit. I just really dont know much about the two. I kno the 347 will benefit from more cubes, but are the 347's really reliable? Ive heard they only last about 100,000 miles? Is that true? Basically can anyone give me a general set of pros and cons for the 331 and 347? Is a 347 the biggest you can bore and stroke a 302? Will a stroker kit be ok on my stock block? Thanks guys

 

vikingpower

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#2

• Jul 24, 2005

• #2

331 is the better compromise between rod ratio/piston design and displacement compared to a 347, but a 306 will last longer than either and be able to spin more RPM's

 

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Scorcher2005

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#3

• Jul 24, 2005

• #3

read this: http://fordmuscle.com/archives/2002/04/331/index.shtml

based on this, the 331 is the obvious choice

 

MeanMussy

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#4

• Jul 24, 2005

• #4

with today's designs, you need not worry about the 347 any more than a 302

 

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Lynx331

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#5

• Jul 24, 2005

• #5

well that was a good read, but im not going to spend 7 bux to read more...

 

MeanMussy

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#6

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yeah.. I thought the same.

 

Modular2v

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Jun 30, 2002

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#7

• Jul 24, 2005

• #7

i like the 331

 

_jb_

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#8

• Jul 24, 2005

• #8

MeanMussy said:

with today's designs, you need not worry about the 347 any more than a 302

Click to expand...

That's why I'm going 347. Plus, I go through about a quart a week in my car, so I don't think a new 347 will eat that much up lol.

 

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Lynx331

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#9

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Will a 331 be able to pull through a big head? Such as a AFR 205 for example?

 

Rick 91GT

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Nov 29, 1999

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#10

• Jul 24, 2005

• #10

Lynx331 said:

Will a 331 be able to pull through a big head? Such as a AFR 205 for example?

Click to expand...

Yes, no issues at all....


331 or 347 both if built correctly will last a long time, and be very reliable you just have to pick the right parts The 347 and 331 both use the same bore size, but the stroker is a 3.4 vs a 3.25, rod length can both be a 5.4 or you can run a 5.315" rod to keep the ring out of the pin on a 347 (my reccomendation)

The power difference between the too is very little...

 

MeanMussy

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#11

• Jul 25, 2005

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Lynx331 said:

Will a 331 be able to pull through a big head? Such as a AFR 205 for example?

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I think this is being discussed in another thread... but yes, the 205 will work on a 331.. but you will loose TQ down low vs. a smaller head. but.. you'll gain top end hp w/ the 205s.

 

Rick 91GT

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Nov 29, 1999

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#12

• Jul 25, 2005

• #12

MeanMussy said:

I think this is being discussed in another thread... but yes, the 205 will work on a 331.. but you will loose TQ down low vs. a smaller head. but.. you'll gain top end hp w/ the 205s.

Click to expand...

Not necessarily it really depends on the rest of the package, just because it is large runner head doesn't mean you will lose low end....common misconception and internet myth.