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Old 02-21-2003, 10:09 PM   #1 (permalink)
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Budget 347 Torque Beast

Friends, my beloved wife and I will be moving into a house with a garage in the next six months, and I will therefore be able to build my dream engine: a roller 347 street engine with AFR heads built for neck snapping torque.

Questions:

-Do I need a forged crank for 5,000 rpm and less operation? I was planning on getting Summit's 347 stroker kit with a nodular iron crank, etc. Good idea for my usage?

-I want this thing to last. Do I need to worry about the wrist pin-in-the-ring/short skirt piston of the 347 stroker? Should I go with the 331 instead?

-What cc AFR small block heads should I get for this street engine?

-What intake and cam specs do I need? I've got an Edelbrock Performer dual plane right now and would like to keep it.

-Car is a 2800 lb. '61 Falcon with 3.70 gear 9 inch, skinny tires and T-5Z tranny. Remember, I want this thing to pull like a mule then cruise, not run top end like a thoroughbred.

Thanks guys. I feel like I know you.
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Old 02-21-2003, 10:39 PM   #2 (permalink)
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Budget 347 Torque Beast

Hello? Is this thing on? Anybody?
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Old 02-22-2003, 04:43 AM   #3 (permalink)
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Budget 347 Torque Beast

I'm no professional or expert, but I've read a bit about the 347, and I've got one myself.

You don't need forged unles you are running forced induction or some huge HP (500+ I think)

The 347 is a little more rough on longevity. you are actually putting more angle on the piston because of the longer stroke. If you build it right, it should run for a very long time.

Intake and Cam are up to you and what you want. Match these all together with how much horsepower you want and what kind of idle you want. I'm sure the performer RPM setup would do ok. shop around though.

My 347 is forged because I one day want to run forced induction. it is considerably cheaper to run nod iron, and unless you run huge power or torque, or force a/f in there, you'll be fine.

You will enjoy the Tq from the 347, it's awesome.


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Old 02-22-2003, 06:35 AM   #4 (permalink)
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Budget 347 Torque Beast

if you want low/mid torque with awsome throttle response forget 4 barrel.....webers are the answer.....ask anyone who "knows" webers

[ This Message was edited by: giddyup1 on 2/22/03 6:59pm ]
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Old 02-22-2003, 01:49 PM   #5 (permalink)
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Budget 347 Torque Beast

Thanks you guys. I think I'll go with nod iron for my use. I've heard of using 2bbl Webers instead of the standard hot rod Holly or Edelbrock 4 bbl. I'll check into it.
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Old 02-22-2003, 09:02 PM   #6 (permalink)
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Budget 347 Torque Beast

I think the AFR 185s are the ones to use for a 331 -- 347. I have ported 165s on my 306.

I have not built a 347 but, if its just a fun machine the low rod ratio should not be a problem otherwise you might consider a 331.

With the right cam it should be a torque monster for you intended under 5000 rpm use.
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Old 02-22-2003, 09:10 PM   #7 (permalink)
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Budget 347 Torque Beast

That's good to know WD. I think I'll go ahead with the nodular iron crank, hyper pistons and 347, rather than 331. This is a total street machine, meant to burn rubber at will, go from stop light to stop light and so on. It will see very little track use if any. I have shorty 5.0 headers on my current 302, and I think I might go to long tubes for the 347, or even hipo 289 manifolds, since this engine will be all about bottom end torque.
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Old 02-23-2003, 06:15 PM   #8 (permalink)
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Budget 347 Torque Beast

Quote:
On 2003-02-22 21:10, HankyJ wrote:
That's good to know WD. I think I'll go ahead with the nodular iron crank, hyper pistons and 347, rather than 331. This is a total street machine, meant to burn rubber at will, go from stop light to stop light and so on. It will see very little track use if any. I have shorty 5.0 headers on my current 302, and I think I might go to long tubes for the 347, or even hipo 289 manifolds, since this engine will be all about bottom end torque.
To obtain max torque use heads with the smallest volume intake ports possible that provide maximum flow (AFR 165s would be a good choice), a dual plane manifold such as a Weiand stealth, tri-Y headers (Dougs or Ford Powertrain applications...not the cheap ones), and a short duration / high lift roller cam such as 270 duration and > .500 lift.

I built a 331 with torque being a big goal and using most of the above guidelines except the cam. I used a flat tappet solid with 282 duration and 0.528 gross lift for higher rpm operation to 6500. Torque is expected to be > 340 ft lbs from 2500 to 6500 with peak of 400 ft-lbs at around 4500. HP is expected to be around 400 at 6000.

If your not looking for more than 5000 rpm and you going to use a roller, a Comp 270HR would be great for torque.
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