Dyno test 440 exhaust manifolds.
#2899626
03/16/21 10:56 AM
03/16/21 10:56 AM
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Joined: Aug 2006
Posts: 2,563 God's Country Maryland
GODSCOUNTRY340
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Nick's Garage just dyno tested a 440 using factory HP exhaust manifolds, max wedge manifolds and headers. Results: HP manifolds---- 375 horsepower------ torque- 389 Max Wedge------ 410 HP ----------------- torque-446 Headers ---------- 419 HP ----------------- torque-463 The headers (1 7/8" tubes) increased 44 horsepower. Back in the day everybody claimed they only gave you 15 more horses.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: Dyno test 440 exhaust manifolds.
[Re: GODSCOUNTRY340]
#2899632
03/16/21 11:05 AM
03/16/21 11:05 AM
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Joined: Jan 2003
Posts: 13,492 Marion, South Carolina [><]
an8sec70cuda
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And I still hear guys today saying the HP manifolds are just as good as headers, lol. Of course they are always the car show type...scared to have to prove anything.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Dyno test 440 exhaust manifolds.
[Re: GODSCOUNTRY340]
#2899639
03/16/21 11:28 AM
03/16/21 11:28 AM
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Joined: Jan 2003
Posts: 31,200 Oregon
AndyF
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Nick's Garage just dyno tested a 440 using factory HP exhaust manifolds, max wedge manifolds and headers. Results: HP manifolds---- 375 horsepower------ torque- 389 Max Wedge------ 410 HP ----------------- torque-446 Headers ---------- 419 HP ----------------- torque-463 The headers (1 7/8" tubes) increased 44 horsepower. Back in the day everybody claimed they only gave you 15 more horses. All depends on the combination. Those dyno tests can be "rigged" by changing the camshaft. The results also will change a lot depending on the muffler and tailpipes that are used.
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Re: Dyno test 440 exhaust manifolds.
[Re: an8sec70cuda]
#2899644
03/16/21 11:35 AM
03/16/21 11:35 AM
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Joined: Dec 2013
Posts: 4,804 Wichita
GY3
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And I still hear guys today saying the HP manifolds are just as good as headers, lol. Of course they are always the car show type...scared to have to prove anything. I always invite car show guys to the dragstrip and they never show...
'63 Dodge 330
11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
9.92 @ 135mph with a 350 shot of nitrous and 93 octane pump. 1.43 60 ft. 3,750 lbs.
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Re: Dyno test 440 exhaust manifolds.
[Re: GY3]
#2899647
03/16/21 11:48 AM
03/16/21 11:48 AM
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Joined: May 2012
Posts: 1,892 South Bend
John Brown
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Car show types wouldn't like the Pure Stock Drags. Most of the cars there are show worthy, and will kick their ash on the strip to boot.
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
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Re: Dyno test 440 exhaust manifolds.
[Re: AndyF]
#2899654
03/16/21 12:11 PM
03/16/21 12:11 PM
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Joined: Aug 2006
Posts: 2,563 God's Country Maryland
GODSCOUNTRY340
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Nick's Garage just dyno tested a 440 using factory HP exhaust manifolds, max wedge manifolds and headers. Results: HP manifolds---- 375 horsepower------ torque- 389 Max Wedge------ 410 HP ----------------- torque-446 Headers ---------- 419 HP ----------------- torque-463 The headers (1 7/8" tubes) increased 44 horsepower. Back in the day everybody claimed they only gave you 15 more horses. All depends on the combination. Those dyno tests can be "rigged" by changing the camshaft. The results also will change a lot depending on the muffler and tailpipes that are used. He didn't change anything on the engine except the manifolds. Go to Youtube and type in Nick's Garage, he's a Mopar guy too.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: Dyno test 440 exhaust manifolds.
[Re: A727Tflite]
#2899682
03/16/21 01:22 PM
03/16/21 01:22 PM
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Joined: Jan 2003
Posts: 14,471 renton, Washington
ph23vo
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Watch the video - the aerial portion above the carbs.
Notice the fuel atomization differences between the three setups. more airflow = higher atomization!
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Re: Dyno test 440 exhaust manifolds.
[Re: A727Tflite]
#2899686
03/16/21 01:25 PM
03/16/21 01:25 PM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
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Watch the video - the aerial portion above the carbs.
Notice the fuel atomization differences between the three setups. I saw that too, interesting. Glad someone posted the numbers, I couldn’t understand a thing he said lol. I’m guessing the difference between the Max and headers is the collector and length-size of tubes. But just bolt on stuff was cool.
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Re: Dyno test 440 exhaust manifolds.
[Re: GODSCOUNTRY340]
#2899725
03/16/21 02:46 PM
03/16/21 02:46 PM
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Joined: Dec 2018
Posts: 88 IL
83hurstguy
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Nick's Garage just dyno tested a 440 using factory HP exhaust manifolds, max wedge manifolds and headers. Results: HP manifolds---- 375 horsepower------ torque- 389 Max Wedge------ 410 HP ----------------- torque-446 Headers ---------- 419 HP ----------------- torque-463 The headers (1 7/8" tubes) increased 44 horsepower. Back in the day everybody claimed they only gave you 15 more horses. All depends on the combination. Those dyno tests can be "rigged" by changing the camshaft. The results also will change a lot depending on the muffler and tailpipes that are used. He didn't change anything on the engine except the manifolds. Go to Youtube and type in Nick's Garage, he's a Mopar guy too. Andy's comment is valid... when you have a cam with a bunch of overlap, the power difference between manifolds and headers will be magnified - headers support scavenging and manifolds don't. As soon as I saw the vacuum gauge reading around 11 in-hg with a pretty lumpy idle, I knew you'd see a big difference. It was impressive to see the max wedge manifolds hang with the headers. When running a factory-type stock cam, I've seen engines only pick up 10-15 hp with headers on back-to-back dyno pulls.
Last edited by 83hurstguy; 03/16/21 02:47 PM.
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Re: Dyno test 440 exhaust manifolds.
[Re: 83hurstguy]
#2899726
03/16/21 02:49 PM
03/16/21 02:49 PM
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Joined: Jan 2003
Posts: 13,492 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,492
Marion, South Carolina [><]
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Nick's Garage just dyno tested a 440 using factory HP exhaust manifolds, max wedge manifolds and headers. Results: HP manifolds---- 375 horsepower------ torque- 389 Max Wedge------ 410 HP ----------------- torque-446 Headers ---------- 419 HP ----------------- torque-463 The headers (1 7/8" tubes) increased 44 horsepower. Back in the day everybody claimed they only gave you 15 more horses. All depends on the combination. Those dyno tests can be "rigged" by changing the camshaft. The results also will change a lot depending on the muffler and tailpipes that are used. He didn't change anything on the engine except the manifolds. Go to Youtube and type in Nick's Garage, he's a Mopar guy too. Andy's comment is valid... when you have a cam with a bunch of overlap, the power difference between manifolds and headers will be magnified - headers support scavenging and manifolds don't. As soon as I saw the vacuum gauge reading around 11 in-hg with a pretty lumpy idle, I knew you'd see a big difference. It was impressive to see the max wedge manifolds hang with the headers. When running a factory-type stock cam, I've seen engines only pick up 10-15 hp with headers on back-to-back dyno pulls. Given what the power output will be w/ a factory stock cam...10-15 hp w/ headers is still a big gain.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Dyno test 440 exhaust manifolds.
[Re: ph23vo]
#2899745
03/16/21 03:34 PM
03/16/21 03:34 PM
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Joined: Mar 2011
Posts: 3,171 Michigan
A727Tflite
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Michigan
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Watch the video - the aerial portion above the carbs.
Notice the fuel atomization differences between the three setups. more airflow = higher atomization! Look again. Notice the pulsing.
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Re: Dyno test 440 exhaust manifolds.
[Re: AndyF]
#2899756
03/16/21 04:00 PM
03/16/21 04:00 PM
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Joined: Jun 2012
Posts: 1,902 MYRTLE BEACH SOUTH CAROLINA
ek3
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Nick's Garage just dyno tested a 440 using factory HP exhaust manifolds, max wedge manifolds and headers. Results: HP manifolds---- 375 horsepower------ torque- 389 Max Wedge------ 410 HP ----------------- torque-446 Headers ---------- 419 HP ----------------- torque-463 The headers (1 7/8" tubes) increased 44 horsepower. Back in the day everybody claimed they only gave you 15 more horses. All depends on the combination. Those dyno tests can be "rigged" by changing the camshaft. The results also will change a lot depending on the muffler and tailpipes that are used. <---> this is where it is...... the correct cam and combo will help overcome the lack in exhaust efficiency . an effective cam would pick up the power on manifolds and there would be little if any from the addition of headers.......
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Re: Dyno test 440 exhaust manifolds.
[Re: ek3]
#2899817
03/16/21 07:12 PM
03/16/21 07:12 PM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
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Nick's Garage just dyno tested a 440 using factory HP exhaust manifolds, max wedge manifolds and headers. Results: HP manifolds---- 375 horsepower------ torque- 389 Max Wedge------ 410 HP ----------------- torque-446 Headers ---------- 419 HP ----------------- torque-463 The headers (1 7/8" tubes) increased 44 horsepower. Back in the day everybody claimed they only gave you 15 more horses. All depends on the combination. Those dyno tests can be "rigged" by changing the camshaft. The results also will change a lot depending on the muffler and tailpipes that are used. <---> this is where it is...... the correct cam and combo will help overcome the lack in exhaust efficiency . an effective cam would pick up the power on manifolds and there would be little if any from the addition of headers....... you’re both missing the point, it wasn’t an all out dyno session of many combination of parts, just three different exhaust types and how they worked on THAT engine. Heck he could’ve put Indy heads, roller cams, you name it, the purpose wasn’t for extracting every bit of HP, just what if. Take what he did and go have a coffee break. Sheesh
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Re: Dyno test 440 exhaust manifolds.
[Re: cudaman1969]
#2899824
03/16/21 07:28 PM
03/16/21 07:28 PM
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Joined: Jan 2003
Posts: 31,200 Oregon
AndyF
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Oregon
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Nick's Garage just dyno tested a 440 using factory HP exhaust manifolds, max wedge manifolds and headers. Results: HP manifolds---- 375 horsepower------ torque- 389 Max Wedge------ 410 HP ----------------- torque-446 Headers ---------- 419 HP ----------------- torque-463 The headers (1 7/8" tubes) increased 44 horsepower. Back in the day everybody claimed they only gave you 15 more horses. All depends on the combination. Those dyno tests can be "rigged" by changing the camshaft. The results also will change a lot depending on the muffler and tailpipes that are used. <---> this is where it is...... the correct cam and combo will help overcome the lack in exhaust efficiency . an effective cam would pick up the power on manifolds and there would be little if any from the addition of headers....... you’re both missing the point, it wasn’t an all out dyno session of many combination of parts, just three different exhaust types and how they worked on THAT engine. Heck he could’ve put Indy heads, roller cams, you name it, the purpose wasn’t for extracting every bit of HP, just what if. Take what he did and go have a coffee break. Sheesh We're not missing the point, we know what the point is since we've done it ourselves many times. I can do a dyno test just like that and have very little difference between HP manifolds and headers. I can also run a dyno test where there is a big difference between manifolds and headers. The test itself is kind of meaningless since it can easily be rigged to provide a wide range of answers. I can do the same thing with rocker arm ratios. I can "prove" that rocker arm ratio doesn't matter or I can "prove" that it matters a lot. All I have to do is use a different camshaft. And if I don't tell anyone what cam is in the motor then most guys won't know the difference. They'll just accept what the magazine article says as fact.
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