317 Heads – All you Need to Know

As a driver or car owner, it is important to know the major part of your car so that you will be able to maintain or fix it directly without causing damage to other parts if it is damaged.

You can’t know what’s wrong with your car if you don’t know all the major parts and their functionality.

In this informative article, I explain what 317 is all about and other related important information that you need to know about 317 heads.

What Are 317 Heads

317 heads have a cathedral-shaped intake port and D-shaped exhaust and large combustion chamber results in lower compression ratios. 317 heads are used for turbo and supercharger applications. It can be used on 6.0L V8 LQ4 and LQ9 engine models. 317 heads have 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 of the reliable and trusted online and offline stores. There are several 317 Heads on eBay, Amazon, and other related online stores in the United States, and other countries of the world.

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

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

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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Frequently Asked Questions About 317 Heads

What LS heads are best?

The LS6 was designed by GM to surpass the LS1 as the best performance head, and it did a brilliant job that the “243” casting was recycled on the LS2. Aside from the LQ9, which is a copy of the LS6, they are the best-performing of the OEM cathedral ports.

Are 317 heads better than 706 heads?

The 317 heads can flow more than the 706 heads by 20 cfm at some lift points. The stock 5.3L 706 heads easily outperformed the 6.0L 317s.

What LS engines had 243 heads?

The LS6 engines from 2001-2006 have 243 heads. The LS motor with 243 heads is powerful and efficient. GM’s 243 heads were found in C5 Corvette before on engines like truck specs LQ4 and LQ9.

What heads are on an LQ4?

The 1999-2000 LQ4 had cast iron cylinder heads. It is all aluminum heads.

What is the difference between LQ4 and LQ9?

The major difference between an LQ4 and an LQ9 is that the LQ4 piston is dished whereas the LQ9 is a flat-top increasing compression to 10:1, and HP to 345 factories, while LQ9 is a limited production engine and desirable as it is the HO 6.0L and comes with a premium price.

What LS comes with 317 heads?

LQ4 engines got Generation III 317 V8 head in 2001. It has cathedral-like intake ports and 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).

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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 243 heads came on the LS6 engine, which was produced from 2001 to 2006. It was typically found in the C5 Corvette, but it was ported to the LQ4 and LQ9 to meet truck specs. It was offered 6cc larger combustion chambers to accommodate the working style vs. speed and acceleration.

What engine did 799 heads come on?

The trucks were manufactured in 2005 and after, and the latest models of 5.3L and 4.8L trucks had 799 heads. In 2010, Chevy 799 heads were manufactured with the L20 4.8L engine. Since its inception, the 799 heads have offered good performance and efficiency on the 4.8 and 5.3-liter truck engines.

Which heads are better: 706 or 243?

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