The LS3 cylinder heads are among the most highly regarded LS heads due to their superior flow capabilities, offering increased power and performance. The state-of-the-art rectangular port heads feature larger intake and exhaust ports, allowing increased airflow and performance. These heads are incredibly powerful and can also be found on popular engines such as the 6.0L truck engines, the Cadillac CTS-V, and even the LS9 in the Corvette ZR1. Whether you're an experienced engine builder or just starting, LS3 cylinder heads are a must-have for any serious engine enthusiast looking to unlock the full potential of their ride.
Unravel the Power of LS3 Heads
Cylinder head porting is a critical component of engine optimization, particularly when it comes to high-performance engines. The process involves modifying the size and shape of the intake and exhaust ports to maximize airflow and improve the performance and efficiency of the machine.
There are various techniques used in LS3 ported heads, ranging from smoothing the surface of the ports with fine sandpaper to polishing and cutting away specific sections to increase airflow.

What is included in LS3 Ported Heads?
High-quality LS3 Cylinder Head Castings
Explicitly designed for 6.0 and 6.2 LS engines, LS3 heads have proven to be an extremely effective upgrade for many different engines. However, LS3 ported heads are engineered with high-quality material (most commonly aluminum and titanium) castings to increase power which further improves airflow and helps to reduce weight compared to stock LS heads.

It features 2.165-inch hollow stem intake valves and 1.590-inch stainless steel exhaust valves. The valves on LS3 heads are designed to be larger than those on stock LS heads to improve airflow, leading to increased power output. Standard valve sizes for LS3 heads include 2.165 inches (intake) and 1.590 inches (exhaust).
However, it’s not uncommon for LS3 heads to feature even larger valves. For example, some aftermarket LS3 heads may have 2.200-inch intake valves and 1.625-inch exhaust valves.
Improved Retainers, Valvesprings, and Locks
While the LS3 heads may come equipped with .550-inch lift single springs, the valve springs of LS3 ported heads will tolerate up to .650 lift. In addition, these LS3 ported heads also feature new retainers, spring seats, and valve seals to ensure optimum durability.
Whether you are building a naturally aspirated engine, using turbo or supercharger technology to boost power output, or looking for an effective way to improve your LS engine's overall performance, LS3 ported heads are great options to help take your project to the next level.
LS3 heads are most commonly used in performance applications for increased airflow and power. LS3 heads are often used in racing engines where every last bit of power is needed.
Additionally, LS3 heads can also be a good choice for street engines that will see occasional track use. This is because LS3 heads can help to make your engine more robust and responsive without sacrificing reliability.
So if you’re looking for a set of ls heads that can offer improved performance, LS3 heads are worth considering.
LS Heads FAQs
How good are LS3 heads?
Given that a stock LS3 head's flow rate is more than 315 cfm and can support over 650 horsepower on the proper application, increasing performance necessitates a decent set of aftermarket heads and an engine with plenty of power. The more air that goes through the engine, the more horsepower it generates.
Are LS3 heads interchangeable?
Rectangular intake ports are found on the LS7, L92, and LS3 heads. Interchangeability between blocks is available for all LS cylinder heads except the LS7 heads. Because of their wider valve layout, the LS7 cylinder heads cannot be used on other LS blocks.
Are LS3 heads good for a boost?
Unlike the naturally aspirated engine, however, the LS3 heads produced more power under boost. The extra power, too, created more significant backpressure. Boost pressure peaked at 7.6 psi at 7,000 rpm and fell to 6.4 psi at 7,500 rpm.
How much power can LS3 heads make?
The LS3 engine block may be boosted to 850 to 1,000 horsepower. Both engines feature rectangular port cylinder heads with a common 4.065-inch bore diameter and internally threaded oil passages for Active Fuel Management (AFM).
Are LS2 and LS3 heads the same?
But the most apparent difference between the two is the displacement. The LS2 has 6.0L of displacement and is technically the first Gen IV Chevrolet engine. The LS3, however, has 6.2L of displacement and is also a Gen IV Chevrolet engine. To no one's surprise, the LS3 heads are better than the LS2 heads.
Can a stock LS3 handle a supercharger?
The LS3 draws from the experience of earlier models in the LS family of engines. Even with a power adder, the factory LS3 bottom end can handle a significant amount of power.
How do I get more power out of my LS3?
Upgrading the LS3 Intake Manifold and Throttle Body The rectangular ports work well, although an aftermarket intake can still produce more power. Shorter runner intake manifolds and single-plane intakes make more top-end horsepower but may lose similar low-end torque.
If you are looking for LS3 heads, Allied Motor Parts is the best place to get them. Call us today.

Source Link: https://www.alliedmotorparts.com/blogs/news/ls3-heads-its-applications

Related Products of LS3 Cylinder Heads:
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NEW CNC Ported LS3 Cyl Heads .650 Springs 2.16/1.59 Valves PAIR

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