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799 Heads – A Detailed Overview

February 28, 2024 | Victor Lukasso

This article will explain all you need to know about the 799 heads.

The type of cylinder mounted on an engine plays a significant role in determining its performance. However, some cylinder heads are built to minimize the engine’s horsepower. On the contrary, some cylinder heads boost the engine’s performance due to their unique architecture and design.

The 799 head is one of them; kindly read on as we discuss the 799 cylinder head and what makes it a perfect fit for your porting needs.

So, I’ll provide a complete analysis of the 799 heads to help you determine what makes them a perfect fit if you need to port your cylinder.


What are the 799 Heads

The 799 heads were among the newly released cylinder heads with a semi-permanent mold model, making them look similar to the 2004 LS 2 cylinder heads (a triangular casting); the only difference is that they are not polished; for example, the 243 cylinder Heads.

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The valve seating of the 799 heads is resistant to pressure, and this can be confirmed by performing a vacuum and pressure test on it. It is built this way to give users a feeling of trust and dependability because it ensures uninterrupted compression.

Also, you can get a valve replacement if you notice the old valve has started lacking; it is made this way to grant your engine greater efficiency.

Faults of the 799 Heads

Just like other cylinder heads, the 799 head fault can be found in the small size of its combustion chamber; this is a defect because while porting to 799 charges, you’ll need to ground the cylinder head to a limit of 0.025 before it can fit into your engine (A smaller combustion chamber).

Aside from the increased engine horsepower from porting to the 799 heads, you must check and balance the good to bad before you port.

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799 Heads Properties

Here are some notable properties of the 799 heads

Compression  9.5:1 
Material  Aluminum 
Exhaust port Design  D-shaped  
Exhaust valve size  1.55 In 
Intake valve size  2.0 In 
Chamber diameter  3.867 
Exhaust port volume  74 CC 
Intake Port Volume  209 CC 
Intake Port Shape Architecture  Cathedral 
Combustion chamber  64 CC 
Compatibility  4.8-litre and 5.3-litre truck engines. 
Target bore size  4.000 

Are 799 Heads any Good?

Yes, they’re one of the best cylinder heads you can purchase in the automotive aftermarket.

In comparison, the 799 heads surpass the 706 heads emission by 20 CFM, a cathedral, and a D-shaped port design. Also, the decreased combustion chamber gives room for higher compression and horsepower.

799 Heads FAQs

What LS engines come with 799 Heads

Most truck engines that run on 5.3L and 4.8L are LS engines with 799 heads and perform exceedingly well because of their complex and small combustion chambers that are cathedral-shaped.

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What does 799 Head Flow?

The 799 heads flow at an exemplary flow of 250.2 CFM at a 0.700-inch lift.

What Engines have the 799 Heads?

Engines that come with the 799 heads are the 5.3L and 4.8L engines usually found in trucks. The 5.3-liter trucks, most especially because of their enhanced power output due to the 799 heads.

Although the 799 heads are built with a 3.90-inch bore, it fits perfectly into 5.3L & 4.8L engine blocks which are relatively less at a 3.78-inch (0.12-inch difference)


The 799-cylinder heads work great, and due to their efficiency, you should notice a significant increase in a vehicle’s horsepower.

However, balance the benefits and dangers before moving to 799 head. You can reach out to your mechanic for a suggestion on which cylinder head is the best for your car.

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Meet Victor Lukasso, the owner of V. Auto Basics. Through this blog, Victor Provides Insights on the latest tips, maintenance, repair, and techniques in the automotive world.