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Old 02-25-2007, 09:45 AM   #1 (permalink)
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331 vs 347 stroker motor

Looking to up-grade from a 302 crate to stroker. I've read the 347 burn/use oil because of the wrist pin intersecting the oil ring, I think many people using 347 in street application. My goal is to have the good power...but still have a good daily driver ie don't want it using oil. Comment from 331 and 347 street user.

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Old 02-25-2007, 10:02 AM   #2 (permalink)
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331 vs 347 stroker motor

Build the 347.

The "use oil" issue is a non-issue in a properly designed and assembled 347.

Use a 5.315 rod if you're concerned about the pin intersecting the oil ring package.
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Old 02-25-2007, 11:19 AM   #3 (permalink)
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331 vs 347 stroker motor

The shorter rod 347 eliminates any potential for problems. Probe makes the piston. Both Probe and Scat make/sell a rod. Its just too easy a "fix" not to do it if you have any concerns at all...
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Old 02-25-2007, 12:45 PM   #4 (permalink)
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331 vs 347 stroker motor

My DD 5.4 rod 347 doesn't burn oil.... As said above it is all about the assembly.
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Old 02-25-2007, 12:57 PM   #5 (permalink)
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331 vs 347 stroker motor

yup, non issue. Talk to these guys, tell them FordMuscle sent you.

http://www.coasthigh.com/Specials/Specials_current.htm
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Old 02-26-2007, 04:39 PM   #6 (permalink)
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331 vs 347 stroker motor

OK, sound like 347 done right is not problem!
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Old 05-30-2007, 05:45 AM   #7 (permalink)
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331 vs 347 stroker motor

The main problem with the 347 is that at higher rpm the piston puts higher than normal pressure on the side of the cylinders compared to a 331. This is due to the longer stroke and rod ratio.
But many have successfully utilized the 347. Personally, I have chose the 331 for my Mustang and had good results too. After doing alot of research and talking with many experts I decided on the 331.
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Old 05-30-2007, 07:36 AM   #8 (permalink)
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331 vs 347 stroker motor

Quote:
On 2007-05-30 05:45, coolreed wrote:
The main problem with the 347 is that at higher rpm the piston puts higher than normal pressure on the side of the cylinders compared to a 331. This is due to the longer stroke and rod ratio.
Rod ratio again huh?

Take a look at this thread and note the opinion of Barry R.

http://www.fordmuscleforums.comstr...lem_55945.html
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Old 06-06-2007, 07:11 PM   #9 (permalink)
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331 vs 347 stroker motor

i bought the scat 331 kit thinking i would get the oil ring above the wrist pin. i wanted the blower pistons,so it brought my rings down(more heat tolerant)guess where my oil ring is.................! sombitches.cant tell any difference at all,no oil consumption no blow by,do the 347.i would deff do a after market block.DART/FMS BOSS.think about it.over 2k in a rotateing assy and a thin wall block,you'll sleep better at night.
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Old 06-07-2007, 08:09 AM   #10 (permalink)
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331 vs 347 stroker motor

get the 347
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Old 06-09-2007, 05:42 AM   #11 (permalink)
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331 vs 347 stroker motor

You need to SPECIFY that you want the 5.315/5.325 short rod version if you want it. Otherwise you'll get the less expensive but more popular 5.4 rod version of the 347 kit.

Whose piston did you use on the 331 - not much reason for that one to punch through - but the blower slugs will force the ring belt down to get clearance for a dish. Another good place for that shorter rod...
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Old 09-03-2007, 10:47 AM   #12 (permalink)
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Re: 331 vs 347 stroker motor

A friend of mine just did a 331 and the main reason this decision was that it did not require any block notching where as the 347 needs to have some block massaging for the rotating assembly to do its thing. The 331 revs nicely and has more power and torque than the 289 it replaced. If I still had my of '67 'stang with the 289/4 speed, I would have definitley gone with the 331 for the replacement engine.
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Old 09-03-2007, 02:41 PM   #13 (permalink)
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Re: 331 vs 347 stroker motor

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Originally Posted by coolreed View Post
The main problem with the 347 is that at higher rpm the piston puts higher than normal pressure on the side of the cylinders compared to a 331. This is due to the longer stroke and rod ratio.
And a 331 places 'higher than normal' (wtf is normal?) pressure on the side of the cylinder than a 302, and a 302 places 'higher than normal' pressure on the side of the cylinder than a 289.

I'm failing to see the relevance =).

Guess the 3.6" stroke 302 I was gonna do will be a pile of junk =D.

Better scrap that idea!

Cris
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Old 09-05-2007, 08:08 PM   #14 (permalink)
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Re: 331 vs 347 stroker motor

Cris, My rod is too long. It puts too much pressure on the sides of the cylinder. What you need to do is build your 3.6" stroke 302 with a 5.090 rod so it will run faster and last longer. LOL!
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Old 09-05-2007, 08:14 PM   #15 (permalink)
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Re: 331 vs 347 stroker motor

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Originally Posted by leethal72 View Post
Cris, My rod is too long. It puts too much pressure on the sides of the cylinder. What you need to do is build your 3.6" stroke 302 with a 5.090 rod so it will run faster and last longer. LOL!
Hell, I'd be happy if I had a 5.09" rod!!





Anyhow...


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