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317 Heads – All you Need to Know

March 15, 2024 | Victor Lukasso

This article will provide valuable information about the 317 cylinder head and related details you need to know.

What Are 317 Heads

The 317 cylinder heads feature a distinctive intake port shape that resembles a cathedral and an exhaust port with a D-shape, coupled with a spacious combustion chamber that produces lower compression ratios. These heads are particularly suitable for turbo and supercharger applications and are compatible with 6.0L V8 LQ4 and LQ9 engine models. Additionally, 317 heads are equipped with powdered metal seats.

317 Heads Specifications

  • 317 6.0L Truck Castings
  • Valve Size: Intake – 2.00, Exhaust – 1.55
  • Port Volume: Intake – 212 cc, exhaust – 76 cc
  • Combustion Chamber: 71.5 cc
  • Target Bore Size: 4.000
  • Chamber Diameter (distance across): 3.923

Where to buy 317 Heads

There are several online and offline stores where you can buy 317 Heads. You can check out any reliable and trusted online and offline stores. There are 317 Heads on eBay, Amazon, and other related online stores in the United States and other countries worldwide.


Check out the GM 6.0L LS LQ4 LQ9 Cylinder Head 317 Assembly Set w/ Rocker Arms Genuine OEM.

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The GM 6.0L LS LQ4 LQ9 Remanufactured Cylinder Heads 317 Assembly Is available on Amazon.

PARTS  317, 12562319, 12562317 
DESCRIPTION  Stock 6.0L LQ4 / LQ9 LS Series Cylinder Head Assembly 
SPECS  Combustion Chamber Volume: 70.03cc 
Checkout on AMAZON  BUY NOW 

317 Heads Specifications




CADILLAC ESCALADE  2002 – 2006  6.0L V8 (364CI) LQ9 
CADILLAC ESCALADE ESV  2002 – 2006  6.0L V8 (364CI) LQ9 
CADILLAC ESCALADE EXT  2002 – 2006  6.0L V8 (364CI) LQ9 
CHEVROLET EXPRESS  2003 – 2007  6.0L V8 (364CI) LQ4 
CHEVROLET SILVERADO 1500  2001 – 2007  6.0L V8 (364CI) LQ4 
CHEVROLET SILVERADO 2500  2001 – 2007  6.0L V8 (364CI) LQ4 
CHEVROLET SILVERADO 3500HD  2001 – 2007  6.0L V8 (364CI) LQ4 
CHEVROLET SILVERADO SS  2004 – 2007  6.0L V8 (364CI) LQ9 
CHEVROLET SUBURBAN  2001 – 2001  6.0L V8 (364CI) LQ4   
GMC SAVANA  2003 – 2007  6.0L V8 (364CI) LQ4 
GMC SIERRA 1500  2001 – 2006  6.0L V8 (364CI) LQ4 
GMC SIERRA 1500  2006 – 2007  6.0L V8 (364CI) LQ9 
GMC SIERRA 2500HD  2001 – 2006  6.0L V8 (364CI) LQ4 
GMC SIERRA 3500HD  2001 – 2006  6.0L V8 (364CI) LQ4 
GMC SIERRA HO EDITION  2004 – 2006  6.0L V8 (364CI) LQ9 
GMC YUKON DENALI  2001 – 2006  6.0L V8 (364CI) LQ4 
GMC YUKON XL 1500  2001 – 2006  6.0L V8 (364CI) LQ4 
GMC YUKON XL 2500  2001 – 2006  6.0L V8 (364CI) LQ4 
HUMMER H2  2003 – 2007  6.0L V8 (364CI) LQ4 
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What LS heads are best?

GM created the LS6 to outperform the LS1, which was successful in its goal, as demonstrated by the “243” casting being reused in the LS2. Except for the LQ9, a replica of the LS6, the LS6 is the best-performing OEM cathedral port.

Are 317 heads better than 706 heads?

The 317 heads can flow up to 20 cfm at specific lift points more than the 706 heads. However, the stock 5.3L 706 heads outperformed the 6.0L 317s.

What LS engines had 243 heads?

The 243 heads were utilized in the LS6 engines manufactured between 2001 and 2006. These heads are known for their exceptional power and efficiency. Before their use in the LS6, GM’s 243 heads were also installed in vehicles such as the C5 Corvette and truck models like the LQ4 and LQ9.

What heads are on an LQ4?

The LQ4 produced from 1999 to 2000 came equipped with cast iron cylinder heads; they feature all-aluminum heads.

What is the difference between LQ4 and LQ9?

The main contrast between an LQ4 and an LQ9 lies in their pistons. The LQ4 has a dished piston, while the LQ9 has a flat-top piston that boosts compression to 10:1 and horsepower to 345 from the factory. Since the LQ9 is a high-output 6.0L engine produced in limited quantities, it is highly sought after and comes with a premium price tag.

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What LS comes with 317 heads?

LQ4 engines got Generation III 317 V8 head in 2001. It has cathedral-like intake ports and a D-shaped exhaust.

How much HP can you get out of a 6.0 LS?

If we run the 6.0L in stock trim, the resulting power output would be 400 hp (on this dyno, the way we test).

Will LS3 heads fit LQ4?

To upgrade to the LQ4 and LQ9, you need to install a set of LS3 heads and intake. The LS3 heads will fit on an LS block with a minimum of 4.000 in.

What engine did 243 heads come on?

The LS6 engine, manufactured between 2001 and 2006, had 243 heads. While it was initially used in the C5 Corvette, it was also adapted to meet the truck specifications of the LQ4 and LQ9 engines. To better suit the working style of these trucks, the 243 heads were given 6cc larger combustion chambers, prioritizing torque over speed and acceleration.

What engine did 799 heads come on?

The 799 heads were introduced on trucks made in 2005 and later, and the most recent models of 5.3L and 4.8L trucks were equipped with these heads. In 2010, Chevy began manufacturing 799 heads on the L20 4.8L engine. Since their introduction, the 799 heads have demonstrated solid performance and efficiency on the 4.8L and 5.3L truck engines.

Which heads are better: 706 or 243?

706 heads are more popular than 243 heads with those who run aspirated engines. However, they don’t have the same size combustion chamber and don’t tend to lower the compression ratio and horsepower.

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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.