The Dodge 5.7-liter Hemi V8 engine is famed for its torque and influence straight from the factory. However, many owners seek to release even more potential from this power.
A set of long-tube headers is one of the best bolt-on upgrades for gaining usually untapped horsepower. Headers improve airflow into and out of each cylinder by replacing the restrictive stock manifolds.
This authorizes more efficient fuel burning and combustion, resulting in noticeable gains across the rpm band. In this article, we will explore how headers Hemi 5.7 work, the benefits they provide to 5.7 Hemis, tips for installation, and dyno-proven results of the horsepower increases achievable through this simple bolt-on modification.
What are Headers?
Headers hemi 5.7, sometimes referred to as header panels or exhaust manifolds, are tubular associates that sit between an engine’s cylinder head exhaust ports and the rest of the exhaust system. Made from durable stainless steel or ceramic-coated alloy, headers hemi 5.7 are designed to route exhaust gases from each cylinder efficiently.
By using multiple, smaller-diameter tubes rather than one large tube, headers decrease restrictive flow and back pressure. They optimize exhaust scavenging to improve cylinder evacuation and increase airflow. With their lightweight construction and precisely shaped flanges, headers are also beneficial for improving engine response and power.
Benefits of Headers on the 5.7 Hemi
Increased low-end and mid-range torque – Headers allow for improved cylinder evacuation at lower rpms for more effortless acceleration.
Higher redline and top-end power – With less restrictive flow, the engine can breathe easier at higher speeds.
Lighter weight – Headers save valuable pounds vs. stock manifolds for snapper acceleration off the line.
Better fuel economy – More efficient combustion allows for optimal usage of fuel for potential mpg gains.
Cooler engine temperatures – Proper airflow prevents hot spots that could lead to detonation.
Engaging exhaust note – The deeper, less muffled tone unleashes the Hemi’s sonorous vocals.
Choosing Headers for a 5.7 Hemi
There are several choices to consider when selecting headers for a 5.7 Hemi engine. Owners must determine whether to go with short or long-tube designs. Shorty headers provide a modest power boost but are easier to install. Long tubes require cutting and custom routing but produce significantly more gains.
Next is deciding between single or dual exhaust and the type of fabrication material for headers hemi 5.7. Budget but durable options include stainless steel while premium headers use ceramic coatings for heat resistance. Fitment is also crucial – ones that match the vehicle’s suspension and body configuration will flow the best. With so many variants, finding the right set of goals and budget is key.
Installing Headers
- Required tools: socket set, wrenches, screwdrivers, jack and stands, hacksaw/ cutoff wheel.
- Removing old manifolds: loosen bolts, detach oxygen sensors, remove bolts and wiggle out manifolds.
- Installing new headers: attach header flanges to the engine with new gaskets and bolts.
- Proper alignment: ensure flanges sit flush to head ports with no air gaps.
- Header wrap: applying heat-resistant wrapping helps protect other components.
- Oxygen sensor installation: screw sensors into headers in stock locations.
- Mock-up test fit: check clearance of all moving parts before lowering the vehicle.
- Lowering vehicle: place headers in position before lowering the engine.
- Attaching mid-pipe: connect headers to mid-pipe/catalytic converter section.
- Torqueing bolts: sequence tightening bolts to spec with a torque wrench.
- Reconnect the battery and test for leaks: start the engine and inspect for leaks.
Tuning After Installation
A proper tune-up is crucial after installing headers to take full advantage of the new configuration. The engine management system will need to be recalibrated to account for the freer-flowing exhaust. Without a tune, issues like rough idling, diminished performance and even hard starting could arise.
It’s best to have a tuner use a truck or dyno with diagnostic software to optimize fuel and ignition timings. This ensures smooth operation throughout the rpm range. Select tunes made specifically for the 5.7 Hemi with long-tube headers will yield the greatest gains. A custom tune unlocks the true potential of the modified engine.
Maintenance and Tips
- Inspect header bolts regularly for tightness to prevent leaks.
- Check oxygen sensor attachments are sealed and sensors are functioning.
- Clean header interiors every 30k miles to remove built-up residues.
- Apply high-heat paint or wrap headers in insulation to protect them from debris.
- Pair headers with free-flowing cat-back exhaust for maximum flow.
- Higher octane fuel may be recommended after headers and tune.
- Watch out for low-hanging obstacles as headers hang lower than stock.
- Monitor for any new sounds or vibrations that could indicate issues.
Conclusion
Headers provide a simple yet effective way to maximize a 5.7 Hemi’s power potential. By replacing restrictive stock manifolds, headers optimize exhaust flow through each cylinder. Owners can expect increased torque across the rpm range from this inexpensive modification.
Proper installation and tuning unlock even greater gains. Headers serve as a foundation for additional bolt-ons and establish potent headers hemi 5.7 platforms for ongoing performance-driving enjoyment.