Quick Answer: How Much HP Gain From Long Tube Headers?

How much horsepower do headers add to a 350?

The length of the primary tubing determines the effective rpm range, but headers can be worth 15-20 hp on the right application.

Run on our restrictive two-barrel 350, the headers improved the power output to 248 hp and 365 lb-ft of torque, with consistent gains through the rev range..

Are headers better than manifolds?

Why are headers are a better choice than an exhaust manifold? As stated above, exhaust manifolds create back pressure, which lowers performance. Because each cylinder of the engine is given its own tube, however, headers eliminate this problem; thus, allowing the gases to exit without the creation of back pressure.

Are headers louder than manifolds?

Another disadvantage of headers is that, due to their thinner walls, they do not absorb as much sound as cast iron exhaust manifolds, making them louder (although some may see this an advantage).

Are shorty headers louder than long tube?

Shorty headers are usually a little louder… especially at part-throttle and Idle.

Will open headers hurt my motor?

While running open headers may not hurt your engine, you could actually end up losing a little bit of torque and gaining horespower. Naturally aspirated engines require some exhaust back pressure to function properly.

How much HP does ax pipe add?

The X-pipe will usually make anywhere from two to four more horsepower than an H-pipe. The slight horsepower difference comes from the way the X-pipe creates a venturi effect, which helps pull the exhaust gases out of the cylinder faster.

Will long tube headers add horsepower?

Longer port pipes result in lower exhaust back pressure. This means improved oxygen intake and a boost in horsepower. … Horsepower and torque output depends on the RPM range. Long tube headers build a ton of power in the mid to high RPM range.

What year is the best Chevy 350 engine?

L31 (2002) From a purely technical standpoint, the most recent version of the Chevy 350 would naturally be the best of the bunch. Marketed as the “Vortec 5700” engine, but known internally by the moniker of L31, this engine was used primarily in GM vans and trucks until 2002.

Are headers bad for your engine?

Headers will not hurt your engine. If anything you actually improve its longevity because you removed the restrictions. Its as if you were running with 5 lb ankle weights as Oem exhaust manifold.

How much horsepower can you get from a 5.7 Hemi?

5.7L Hemi Applications and Estimated Horsepower The engine displaces 5.7L or 348 CID, and at its introduction produced one horsepower per cubic inch. Upgrades to the 5.7L motor raised output to 390 horsepower.

Are long tube headers worth it?

Another advantage with long-tube headers is that they not only give solid peak power numbers, but help to raise horsepower and torque in the low and mid-range of the RPM band, giving you more useable power down where you usually need it.

How can I get more horsepower out of my 5.7 350?

No matter what application your Chevy 350 motor is in, a few simple steps can get you more better performance and higher horsepower.Modify your air intake. … Modify your exhaust. … Change your camshafts and valve train. … Purchase new cylinder heads, or have yours ported and polished. … Have your motor rebuilt and blueprinted.

What is the best brand of headers?

Popular Exhaust HeadersDoug Thorley Headers.PaceSetter Headers.Hooker Headers.Gibson Headers.

Should you wrap headers?

Header Wrap keeps the heat in the pipes. This improves exhaust flow and The Scavenging Effect. It also lowers underhood temps. Wrapped headers will make a little more Torque and Horsepower than a bare metal set.

Can you put 400 heads on a 350?

400 heads on a 350 block is a great way to increase your midrange and top end power. The swap is a direct bolt – on deal, you just need to be sure to use 400 head gaskets when you do the swap.

How much horsepower does long tube headers add to a 5.7 Hemi?

Run this way, the Hemi made 434 hp at 6,100 rpm and 439 lb-ft of torque at 4,500 rpm. Note the 1 5/8-inch headers improved both the peak horsepower and peak torque numbers. Not only that, the long-tube headers improved the Hemi’s power output through the entire rev range, from 3,000 to 6,300 rpm.

What sounds better short or long headers?

Shorty headers aren’t as loud as long tube headers, although they’ll definitely have better sound than your stock manifold. You can choose unequal length headers for better sound, but equal length is the way to go for consistent gains in performance.

Do headers make the car louder?

Headers alone will not make it any louder. Midpipes and mufflers will give you louder exhaust.

How much horsepower does a cold air intake add to a 5.7 Hemi?

So, you can already imagine that if you go through a cold air intake process, you are going to see a visible difference in the horsepower of your Hemi 5.7L. The horsepower might improve to 390 if you maintain the right process of cold air intake.

How much do headers increase horsepower?

In general, a quality set of headers should provide an increase of approximately 10-20 horsepower, and if you’re restrained with your right foot, you may even see an increase in fuel mileage.