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Jun 14, 2014 | 11:23 AM

Lloyd Smale

Thread Starter

Le Mans Master

Joined: Dec 2000

Posts: 5,761

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From: munising MI USA

header question

I know long tubes are the way to go for hp but is there some gain on an lt1 with short tubes.

Jun 14, 2014 | 11:00 PM

tombrammer

Pro

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http://www.superchevy.com/how-to/eng...-motor-part-2/
LT's added 10 hp throughout the rpm band in this test, shorties would be I guess about 1/2 that.

Jun 15, 2014 | 05:46 AM

Lloyd Smale

Thread Starter

Le Mans Master

Joined: Dec 2000

Posts: 5,761

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From: munising MI USA

I would have expected a bigger gain with the long tubes. Most say 20 hp but i guess the dyno doesnt lie. kind of suprised the heads didnt add more in that test too. Seems like the real power is in the cam.

Last edited by Lloyd Smale; Jun 15, 2014 at 05:52 AM.

Jun 15, 2014 | 06:21 AM

65Z01

Team Owner

Joined: Dec 2000

Posts: 90,675

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From: SE NY

Cruise-In II Veteran

Quote:

I would have expected a bigger gain with the long tubes.

Maybe that's because the LT1 exhaust is already pretty free flowing with true duals and all.

Jun 15, 2014 | 08:26 AM

STL94LT1

Race Director

Joined: Jan 2002

Posts: 12,261

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From: O'Fallon Missouri

Hooker shorties vs EM longtubes on my 94.

Jun 15, 2014 | 12:00 PM

cumbercr

Melting Slicks

Joined: Mar 2008

Posts: 2,141

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From: Santa Maria, CA

Quote:

Originally Posted by Lloyd Smale

The gains realized from any swap depend on the whole build. I recently had to swap my long tubes for the stock manifolds for a smog test. The power loss from stock manifolds was definitely more than 10 Hp.

Jun 16, 2014 | 07:01 AM

grandspt

Drifting

Joined: Jul 2004

Posts: 1,347

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From: MA

I can say that I feel more than 10 horsepower after installing my ARH
1 3/4" headers on my LT4. I used race my old Camaro at the dragstrip in the 80's-90's and I can tell you that long tube headers give more than 10 HP!

Jun 16, 2014 | 07:27 AM

Slammed337

Instructor

Joined: Jul 2010

Posts: 214

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I agree more than 10rwhp I'd say.
I made 289.2 with only long tubes and 1.6RR's and tune
About 45rwhp more than stock
Basing on a 15% drive train loss

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Jun 16, 2014 | 12:50 PM

PLRX

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From: Riverside County Southern California

Co-winner 2020 C4 of the Year - Modified

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St. Jude Donor '09 thru '20

Quote:

Originally Posted by tombrammer

http://www.superchevy.com/how-to/eng...-motor-part-2/
LT's added 10 hp throughout the rpm band in this test, shorties would be I guess about 1/2 that.

This is not co$t effective. The LTH cost plus labor for only 10 horses????

Something got to be wrong here unless that was a main line dyno

Quote:

Originally Posted by Slammed337

I agree more than 10rwhp I'd say.
I made 289.2 with only long tubes and 1.6RR's and tune
About 45rwhp more than stock
Basing on a 15% drive train loss

Was this a L98 or LT1?

There are old threads here stating better HP gains wit LTH..

Jun 16, 2014 | 04:37 PM

#10

92C4M6

Racer

Joined: Mar 2014

Posts: 253

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20rwhp with LTs and 2-3mph in trap speed...I've put 4 sets of lt1 headers in all with these results

Jun 16, 2014 | 06:54 PM

#11

SteveDoten@ARH

Premium Supporting Vendor

Joined: Aug 2008

Posts: 1,964

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From: Deer Park NEW YORK

We have a dyno now in-house here at ARH, I'd like to do a before/after with a C4 here.

I'll see if there is any dyno from past installations.

Jun 17, 2014 | 05:36 AM

#12

Lloyd Smale

Thread Starter

Le Mans Master

Joined: Dec 2000

Posts: 5,761

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From: munising MI USA

id also like to see some real world testing on a set of short tubes. It would be cool to see a shootout testing both compared to stock on a lt1

Jun 17, 2014 | 03:27 PM

#13

PLRX

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From: Riverside County Southern California

Co-winner 2020 C4 of the Year - Modified

2018 Corvette of Year Finalist

2017 C4 of Year

2016 C7 of Year Finalist

St. Jude Donor '09 thru '20

Quote:

Originally Posted by 92C4M6

20rwhp with LTs and 2-3mph in trap speed...I've put 4 sets of lt1 headers in all with these results

Damn thats not a lot when you grab a calculator, and compare cost with effectiveness.

New headers, new hardware, new catalysts converters, to modify existing exhaust or to buy a new one, a tune, and labor co$ts unless you DIY.