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Old 07-07-2003, 03:33 PM   #1 (permalink)
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347 Stroker/How to make Horsepower?

I have read so many things on stroking a 302 to a 347 and making loads of horsepower, but it seems to me that everywhere I read, the horsepower isn't really much more than just the plain old 302. Can anybody help me out? How much more horsepower are guys getting from a 347 as opposed to a 302? And if it is really a good bit more than what makes so much more power? I already know that the stroke is longer, but after buying a stroker kit and having everything machined, does it justify building a 347 rather than a 302??
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Old 07-07-2003, 04:37 PM   #2 (permalink)
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347 Stroker/How to make Horsepower?

While I"ve not recently put anything together, 'that small', the good engines are running GOOD heads. The secret of unlocking any small block's HP. Good heads.

(heh heh heh.........he said head).........
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Old 07-07-2003, 04:50 PM   #3 (permalink)
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347 Stroker/How to make Horsepower?

Others more enlightened may disagree with my statement, but the advantage to stroking out the 302 to 347 is that you instantly have a lot more torque by virtue of the added cubes, even if you don't do much else to your engine, and that's great for a street car. And added cubes give you the potential for much more horsepower, and that will have most to do with the heads, cam, intake and induction selection.
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Old 07-07-2003, 04:59 PM   #4 (permalink)
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347 Stroker/How to make Horsepower?

Quote:
On 2003-07-07 15:33, lakecityg wrote:
.....the horsepower isn't really much more than just the plain old 302......
Check out the Dyno Pages forum for some good numbers.

Don Garlits once said "No replacement for displacement". And it still holds true IMHO.

Most folks that put together a stroker regardless of cid will use high quality/high performance components matched to their desired performance level. Ron Feddema has a 347 that dyno'd a little over 600 hp . Not your every day stroker, to be sure, but a good example of the potential.

If you haven't seen the difference between the 347 and a "plain 302" you haven't looked in the right places.


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Old 07-07-2003, 05:03 PM   #5 (permalink)
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347 Stroker/How to make Horsepower?

i have seen a 347 that made 849 horses; although, it was blown. but still....
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Old 07-07-2003, 08:30 PM   #6 (permalink)
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347 Stroker/How to make Horsepower?

ok i haven't looked in the right place. can someone show me the right place? i am building a 347 and I want it to roll. whats hypothetical combos?
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Old 07-07-2003, 09:36 PM   #7 (permalink)
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347 Stroker/How to make Horsepower?

Check out my build... 347 stroker... This motor should rock and roll once running... I am looking to run in the low 11's with this combo.... Should be firing it this weekend sometime

http://www.fordmuscle.com/phpBB/view...5886&forum=1&3

Good Luck, Billy
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Old 07-07-2003, 09:46 PM   #8 (permalink)
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347 Stroker/How to make Horsepower?

Quote:
On 2003-07-07 20:30, lakecityg wrote:
ok i haven't looked in the right place. can someone show me the right place? i am building a 347 and I want it to roll. whats hypothetical combos?
Anything that will work for a 302/5.0 will work for a 347, you just need to go a little bigger with the cam, intake and heads. In general a good street engine should push about 1.2hp/cube, torque is about the same.
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Old 07-07-2003, 09:48 PM   #9 (permalink)
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347 Stroker/How to make Horsepower?

My 347 with big valve E7TE heads and a Comp
Cams Magnum 280HR with custom LSA specs out at 383 HP at 5800 rpm. This is on a cam modeling program that Motor Machine Supply
out in Tuscon uses. This is a daily driver
and the seat of the pants difference over the
302 is mighty fine! The low end torque is
way up, makes you tend to short shift a lot.

Bruce

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Old 07-07-2003, 10:08 PM   #10 (permalink)
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347 Stroker/How to make Horsepower?

A longer stroke not only increases torque, but also the amount of air and fuel the motor can pump. That means you don't have to rev the motor up higher to feel the increase in power.

A 347 can make a bunch of HP. Look at what Nascar does with their small cubic inch motors. Just remember that a stock 289/302 block is not built to handle a lot of torque stress, so you must use a lightweight body to make it last. Keep the body weight under 3000 lbs and use some AFR 205 or TFS R heads with a cam, intake, and exhaust system that can support the HP level you're after and the power:weight ratio will be awesome! Just depends on how much you wanna spend.

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Old 07-08-2003, 09:04 AM   #11 (permalink)
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347 Stroker/How to make Horsepower?

Is this an ideal combo to make a car run into the 11's maybe? 400 plus horsepower?
These are my motors specs
1979 - 347 Stroker
10:1 Compression
Holley 670 Street Avenger or a Holley 650(I have both)
Roush 200 Cylinder Heads(minor head work)
1.6 Roller Rockers
Shorty BBK Headers
3.73 Rear End
5 Speed Transmission
Cross Gap Intake (Power Band 1500-6500)
FlowMaster Dual Exhaust(of course no Cats)
MSD 6Al
Mallory Distributor

And these are the specs on the cam that was recommended to me.
Hydraulic Roller
230/236 @.050
544/555 Lift
108 Lobe Separation
1800-6500 powerband
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Old 07-08-2003, 09:22 AM   #12 (permalink)
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347 Stroker/How to make Horsepower?

If my little 331 makes 425 HP and run 11s with full street trim and only 3.50 gears, your 347 combo should do it easily. May run 10's with slicks and 4500 rpm launch! If it doesn't, then a 750 and Victor jr should get you there.
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Old 07-09-2003, 12:25 AM   #13 (permalink)
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347 Stroker/How to make Horsepower?

Other guys have already talked about this same point, but for me the advantage of a stroker is the opportunity to stretch the horsepower (& more importantly the torque) over a broader RPM range.

I love small block Fords, but the one drawback is that the power tends to fall within a fairly narrow RPM range compared to bigger engines, and when you make modifications to increase the horsepower, the power range moves up the RPM scale, and usually comes at the expense of lower RPM torque. It seems like a tug of war and you always seem to lose something for everything you gain.

Strokers offer the opportunity to get the best of both sides by increasing horsepower and torque without (necessarily) having to push the RPM's into difficult streetability ranges. Of course you can build a stroker for whatever power profile you want, but you don't have to sacrifice something for every other gain.

Just start with a solid foundation: a bullit-proof short block. And for my soapbox speech again I'll say don't use a 289 block. People on this forum keep shooting me down on that topic, but when you're going to add stroke to an already tiny block you need every 1/8th or 1/16th or 1/32 or 1/64th of cylinder skirt you can get down there. Turning a 289 into a 347 means going from 2.87 stroke to 3.4 stroke. That's over half an inch and an 18% increase in stroke. Even the 331 is pushing it. Everybody knows that .30 is the maximum recommended overbore for Ford small blocks, but everyone has heard of someone going .60 on them without 'blowing up'. Now guys are doing the same thing with strokers, and when they don't blow up, they think they're doing OK.

I still can't figure out why anyone would put $1000+ into a set of aluminum heads and gamble everything on some local guy's advice by using a 289 block that Ford lists as maximum 3.1 inch stroke while seasoned 5.0 blocks or new Ford Racing blocks are so plentiful and cheap in comparison to all the other stuff bolted onto these engines.
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Old 07-09-2003, 05:48 AM   #14 (permalink)
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347 Stroker/How to make Horsepower?

go a solid roller,afr,vic jnr's or tfs heads will make good hp
my 347 with windsor snr's(a reasonable set of heads)and a solid flat cam is making around 430 fwhp and i loose top end hp because of the webers(they are a trade of for low end torque)
so if you have the cash listen to the guys who know!
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Old 11-15-2009, 12:00 PM   #15 (permalink)
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Re: 347 Stroker/How to make Horsepower?


Last edited by parky33; 11-17-2009 at 10:07 AM.
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