How Much Horsepower Do Headers Add To A 350


While most people associate horsepower with large, muscle car engines, there is another way to add power to your vehicle! Header bars or headlamps are an underrated source of additional performance that few look into fully.

Headlights have motors inside them that work together to increase the brightness of the light being emitted from the lamp. By adding more powerful bulbs and using better materials for the filament, we can make our headlights much brighter than what they were years ago!

By replacing your current factory lamps with higher end units, you can easily upgrade your performance while still keeping the same style headlight design. It’s also very affordable!

There are many different types of aftermarket headlamp vendors who offer high quality products at low prices. Many even include free shipping! The only thing you will need to do is research which ones are reputable sellers before making a purchase.

Some brands are slightly heavier than others, but none are extremely heavy so it won’t matter too much in the hands of a skilled mechanic or driver.

History of horsepower

how much horsepower do headers add to a 350

When it comes down to it, most people recognize what a big difference engine headers make by looking at cars with no headers. These are usually very modest performance enhancements- they may be able to go slightly faster because there’s less resistance when cruising along, but hardly anyone believes that those don’t look cool!

Headers do more than just look good though! They increase airflow which helps push air across the surface of the car’s body and out of the vehicle. This increases cooling efficiency and reduces heat build up in the engine, helping it run better and quicker.

A well designed header system will also improve fuel economy due to reduced drag. In fact, some say it is possible to get 4% better gas mileage by installing headers!

History of horsepower

When it comes down to it, many experts agree that horsepower numbers we see these days are overstated. A lot of this has to do with how engineers measure horsepower.

Originally, engines were measured using something called “brake mean effective pressure” or BMEP for short. This was calculated by taking the weight of the engine (including all pistons, valves, etc.) and dividing it into two parts: one for momentum and one for friction. The part for friction included things like drag from moving pieces such as wheels and head gaskets as well as wind resistence caused by the shape of the engine.

How much horsepower does a header add?

how much horsepower do headers add to a 350

Adding headers is one of the most cost-effective ways to increase engine performance in any make or model vehicle! Header tanks come in many shapes and sizes, but they all work by redirecting some of the gasses that are exiting the combustion chamber and the car away from the main tube of the head, and instead towards an attached pipe called a intake runner. The longer the tank you have, the better!

The length of the intake runners depend on how big your cylinder bores are, and what kind of cam profile you want. More advance cams need longer runners to help pull more air into the engine! For instance, if you were looking at installing a factory Performance Cam Profile (PCP) kit on a stock 351 Windsor with OEM heads, then our best advice would be buying a long enough intake runner for a K&N filter canister replacement tip so you don’t run out of room!

A good source to look at is They do lots of comparisons and articles about different sized headers, as well as installation tips, too.

Calculate your horsepower needs

how much horsepower do headers add to a 350

When it comes down to it, how much power your engine makes depends on two things: how many cubic feet of air you have and what type of fuel you are using. The first is known as effective displacement, or volume. This is simply the amount of material in the system (cylinders plus chamber) divided by its total area. The second is referred to as actual efficiency, which takes into account how well the engine uses the air-fuel mixture and how efficiently the valves work.

The effective efficiency number comes directly from your manufacturer and should be easy to find under “engine performance” or something similar. Actual efficiency can usually be determined by looking up data for specific engines online. People who do this really close in on the true overall efficiency because they know their engine’s computer software!

We were talking about efficient headers above so we will use those numbers as an example here. An easy way to determine if your current setup is adequate is to compare it with our examples. If more powerful horses result, then you are good to go!

Our one chart covers all types of applications including stock, tuned, race, etc. Just remember that longer tubes reduce flow areas and may hurt top end speed slightly depending on the vehicle and driver. A shorter tube could help deal with some back torque at lower speeds but lose out in high rpm head gasses.

Buying your headers

how much horsepower do headers add to a 350

When it comes down to it, most people start with a basic washable or non-washable header style and add performance features such as air intake pipes and throttle plate covers later. It is very common to find someone who has all of the above and then another person who does not!

The difference in these two individuals’ engines are what makes the engine run. The fuel injectors, the air filter, and the size of gas tank do not make much of a difference unless you have a really large amount of money to spend. What adds horsepower is the cylinder head.

A high quality aftermarket cylinder head will cost anywhere from $200 – $1,000 depending on how many valves there are and whether they are cast iron or aluminum.

Installing your headers

how much horsepower do headers add to a 350

When installing your car’s new header system, make sure you are very careful not to bend or crush any of the intake pipes or tubes.

This can damage the engine, and may even cause it to fail. Make sure everything is lined up properly before starting the engine for the first time!

You also need to check that all gaskets are in place and functional.

Testing your headers

When performing performance enhancements such as installing aftermarket headers, make sure you do it correctly! Testing your headlamp(s) is one of the most important steps in the process.

A lot of people install headlights that are very bright and flashy, but they never test them to see if they work properly.

It is extremely difficult to tell whether their lights will actually function properly unless you have tested them.

You should always test your new headlight before installation by driving with the installed light for an extended period of time. Make sure to get some good mileage under real conditions to ensure it works well.

Once everything is working properly, you can start trying to increase the horsepower output of your vehicle! Keep reading for more information about how to easily test your headlights.

Choosing the right size headers

how much horsepower do headers add to a 350

When it comes down to it, how much horsepower your engine makes is mostly dependent on two things: how many pounds of air you are able to push through every minute interval of combustion and how efficiently you can get this air from empty to full. The first part is determined by the quality and shape of your intake passageway, while the second depends on the diameter of your airflow meter or gauge.

The bigger your gauge, the more air you have at any given moment, which is why most performance engineers use larger gauges when measuring peak power! This article will go into greater detail about what sizes are best for different applications, but your idle speed is one very important factor to consider.

Idle engines require less air than running under load, so making sure your car has enough air at rest is an essential piece to increasing top end torque.

Connecting your headers

how much horsepower do headers add to a 350

When installing aftermarket performance enhancements, you will need to make sure that you have done your research first!

Before doing anything with your car, you must check out all of the parts thoroughly. This includes how much horsepower and torque they add to your vehicle, as well as what is needed for installation.

Make sure to do your homework before buying or trying them out yourself! Buying online may offer very limited information about the part, and it could be a bad purchase.

Also remember that not every source is honest when advertising their products. Some sellers exaggerate how powerful their product can be to earn more money.

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