799 Heads – A Detailed Overview

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

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

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

So, I’ll provide you with a complete analysis of the 799 heads to help you find out what makes them a perfect fit if there’s a 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.

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 based on the fact that it ensures uninterrupted compression.

Recommended:  How Long do Spark Plug Wires Last?

Also, you can also 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 heads fault can be found in the small size of its combustion chamber, this is a defect because while porting to 799 heads, 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).

Asides from the increased engine horsepower that comes from porting to the 799 heads, it’s important that you check and balance the good to bad before you port.

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, of course, they’re one of the best cylinder heads you can purchase in the automotive aftermarket at this time.

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.

Recommended:  Why Can't an Electric Car Charge itself While Driving

799 Heads FAQs

What LS engines come with 799 Heads

The majority of truck engines that runs on 5.3L and 4.8L are LS engines with 799 heads and they perform exceedingly well because of their complex and small combustion chambers that are cathedral shaped.

What does 799 Head Flow?

The 799 heads flow at an outstanding flow of 250.2 CFM at an 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 being as a result of 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 the horsepower of a vehicle.

However, check and 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.

How helpful was this post?