347 EFI Low Power

deathb4dismount · Jul 12, 2022

You could nickel and dime 25ish hp with bolt ons. 80MM MAF, power pipe 75 MM TB, Systemax II and long tubes, but that wont feel like nickels and dimes to your pockets. Plus it still will drive like a car with a mismatched converter. Or you could take it to another tuner and magically make a friendly 20 more hp. Some Dynos are stingier than others. Was this on a Mustang Dyno or Dynojet? At the end of the day I'd take a hard shifting fun 320 HP over a wet noodle shifting 350HP. Spend the $$ on the converter then go from there.

90sickfox · Jul 12, 2022

I believed long tubes were always better until I read this article. There was another on in one of the popular mustang mags years ago, too. The shorties made more power in the streetable range due to exhaust scavenging. I'm sure that design and tube size had a lot to do with that. Wish I could find the old paper article.

Ford 351W Dyno Test: Shorty Versus Long-Tube Headers

The efficiency of long-tube headers over shorty headers is demonstrated on the dyno with 16 more HP and 16 lb-ft of torque on a mild 351W Ford small-block.

www.motortrend.com

General karthief · Jul 12, 2022

90sickfox said:
I believed long tubes were always better until I read this article. There was another on in one of the popular mustang mags years ago, too. The shorties made more power in the streetable range due to exhaust scavenging. I'm sure that design and tube size had a lot to do with that. Wish I could find the old paper article.

Ford 351W Dyno Test: Shorty Versus Long-Tube Headers

The efficiency of long-tube headers over shorty headers is demonstrated on the dyno with 16 more HP and 16 lb-ft of torque on a mild 351W Ford small-block.

www.motortrend.com

you better go back and read that article again.
When equipped with the long-tube headers, the power output of the 351W improved from 404 hp and 413 lb-ft to 420 hp and 429 lb-ft of torque. The long-tube headers improved the power output through the entire rev range,
keep in mind this is a larger 'air pump' so results will very with miss matched parts but over all long tubes win, sometimes the 'win' is small.
Oh, and the article stated '1" primaries ' but they are 1 5/8
Typo I'm sure.

90sickfox · Jul 12, 2022

General karthief said:
you better go back and read that article again.
When equipped with the long-tube headers, the power output of the 351W improved from 404 hp and 413 lb-ft to 420 hp and 429 lb-ft of torque. The long-tube headers improved the power output through the entire rev range,
keep in mind this is a larger 'air pump' so results will very with miss matched parts but over all long tubes win, sometimes the 'win' is small.
Oh, and the article stated '1" primaries ' but they are 1 5/8
Typo I'm sure.

Yeah I read that. On that application it made power all across the board but if the design of the headers was different the result could be different. That's what the old paper article was saying. I found ( what I think is the article )but the link does not work.

96pushrod · Jul 13, 2022

90sickfox said:
Yeah I read that. On that application it made power all across the board but if the design of the headers was different the result could be different. That's what the old paper article was saying. I found ( what I think is the article )but the link does not work.

Would be an interesting read if you can find it. Not often you see a short tube perform better.

90sickfox · Jul 13, 2022

96pushrod said:
Would be an interesting read if you can find it. Not often you see a short tube perform better.

Now that I've had time to really think about it...I think the mid length won the challenge in all categories. It was probably due to design. Headers have come a long way over the years. The designs have definitely changed with newer technology and manufacturing processes. Back when that article was written the E cam was probably hailed as the best street camshaft.

General karthief · Jul 14, 2022

Here is a thread from a past member that has been building headers for cars since the beginning, or close to. He likes the mid length type, mostly racing stuff but does get into street headers too.

Exhaust - Headers - Myths and Secrets...

Good decisions come from experience. Experience comes from making bad decisions. This is a famous quote from Mark Twain. Selecting headers for your Mustang is all about making decisions. You will have to decide which style header is best for your combination; long tube, shorty style, mid...

www.stangnet.com

96pushrod · Jul 14, 2022

General karthief said:
Here is a thread from a past member that has been building headers for cars since the beginning, or close to. He likes the mid length type, mostly racing stuff but does get into street headers too.

Exhaust - Headers - Myths and Secrets...

Good decisions come from experience. Experience comes from making bad decisions. This is a famous quote from Mark Twain. Selecting headers for your Mustang is all about making decisions. You will have to decide which style header is best for your combination; long tube, shorty style, mid...

www.stangnet.com

It’s sad to see the only guy who made headers for rci pass away.

General karthief · Jul 14, 2022

96pushrod said:
It’s sad to see the only guy who made headers for rci pass away.

Who? An employee?

96pushrod · Jul 14, 2022

General karthief said:
Who? An employee?

Greg, the guy who did all the fabricating for them. They no longer make headers

mrspeed · Jul 16, 2022

https://www.motortrend.com/how-to/1406-long-tube-vs-shorty-headers-pipe-dreams/

Engine Masters did an episode on a higher hp engine than that article and the gains were expontenially better as expected.

w_jake17 · Jul 19, 2022

deathb4dismount said:
You could nickel and dime 25ish hp with bolt ons. 80MM MAF, power pipe 75 MM TB, Systemax II and long tubes, but that wont feel like nickels and dimes to your pockets. Plus it still will drive like a car with a mismatched converter. Or you could take it to another tuner and magically make a friendly 20 more hp. Some Dynos are stingier than others. Was this on a Mustang Dyno or Dynojet? At the end of the day I'd take a hard shifting fun 320 HP over a wet noodle shifting 350HP. Spend the $$ on the converter then go from there.

What i am ending up doing is porting my throttle body and intake manifold. I am receiving my valve body this week and will install that. I need to get my driveshaft balanced so when that happens I will put a 3000 or so stall in it. I should make 340ish to the wheels if my intake was truly the choke point and it should be based off of flow charts. Unfortunately no long tubes cause I am not about to deal with that pain on an Aod and then I would have to get new h pipe etc

TOOLOW91 · Jul 20, 2022

w_jake17 said:
What i am ending up doing is porting my throttle body and intake manifold. I am receiving my valve body this week and will install that. I need to get my driveshaft balanced so when that happens I will put a 3000 or so stall in it. I should make 340ish to the wheels if my intake was truly the choke point and it should be based off of flow charts. Unfortunately no long tubes cause I am not about to deal with that pain on an Aod and then I would have to get new h pipe etc

You guessing on the converter or did you actually talk to someone at one of the converter places ?

w_jake17 · Jul 20, 2022

TOOLOW91 said:
You guessing on the converter or did you actually talk to someone at one of the converter places ?

I still need to talk to someone, I'm just guessing as of now. Will definitely talk to someone when I get to it.

Bullitt347 · Jul 20, 2022

General karthief said:
Here is a thread from a past member that has been building headers for cars since the beginning, or close to. He likes the mid length type, mostly racing stuff but does get into street headers too.

Exhaust - Headers - Myths and Secrets...

Good decisions come from experience. Experience comes from making bad decisions. This is a famous quote from Mark Twain. Selecting headers for your Mustang is all about making decisions. You will have to decide which style header is best for your combination; long tube, shorty style, mid...

www.stangnet.com

George Klass made the headers for my race car. 2"- 2 1/8" stepped with a 4" collector. Not cheap, work great. Fit great, PITA to install.

TOOLOW91 · Jul 20, 2022

Bullitt347 said:
George Klass made the headers for my race car. 2"- 2 1/8" stepped with a 4" collector. Not cheap, work great. Fit great, PITA to install.

Same with mine . Fit mint . They suck to install - for what he used to charge I think he should’ve offered stainless for a bit more

347 EFI Low Power

deathb4dismount

Crap, didn’t realize my crotch was in that picture

90sickfox

Wasn't a pretty sight...and I've got big hands

Ford 351W Dyno Test: Shorty Versus Long-Tube Headers

General karthief

wonder how much it would cost to ship you a pair

Ford 351W Dyno Test: Shorty Versus Long-Tube Headers

90sickfox

Wasn't a pretty sight...and I've got big hands

96pushrod

I think they're a little easier to get off

90sickfox

Wasn't a pretty sight...and I've got big hands

General karthief

wonder how much it would cost to ship you a pair

Exhaust - Headers - Myths and Secrets...

96pushrod

I think they're a little easier to get off

Exhaust - Headers - Myths and Secrets...

General karthief

wonder how much it would cost to ship you a pair

96pushrod

I think they're a little easier to get off

mrspeed

w_jake17

Member

TOOLOW91

If you're the village idiot what's that make me?

w_jake17

Member

Bullitt347

I have been doing it wrong this whole time

Exhaust - Headers - Myths and Secrets...

TOOLOW91

If you're the village idiot what's that make me?

Similar threads

347 EFI Low Power

Crap, didn’t realize my crotch was in that picture

Wasn't a pretty sight...and I've got big hands

wonder how much it would cost to ship you a pair

Wasn't a pretty sight...and I've got big hands

I think they're a little easier to get off

Wasn't a pretty sight...and I've got big hands

wonder how much it would cost to ship you a pair

I think they're a little easier to get off

wonder how much it would cost to ship you a pair

I think they're a little easier to get off

Member

If you're the village idiot what's that make me?

Member

I have been doing it wrong this whole time

If you're the village idiot what's that make me?

Similar threads

Privacy & Transparency

Privacy & Transparency