LQ4/LQ9 CNC Ported 317 Heads .650 Springs 2.02/1.59 Valves PAIR

Part#: ALL-65057PC

Manufacturer: Chevrolet

Year Range: 97-04

Engine Size: 6.0L - V8

Description: CNC Ported LQ4/LQ9 "317 casting" PAIR

Intake - 243CC

Exhaust - 95CC

Combustion Chamber - CNC 73CC

.650 Dual Springs, New retainers, spring seats, and valve seals.

These are CNC ported heads. They offer great added HP and are produced from factory GM heads. All combustion chambers are machined to create a balanced cylinder volume.

All work is done in house on our own 5-axis Rottler CNC,

Looking to supercharge your LS1 or LS6 engine? Our CNC-ported 317 are a perfect match, but you may also look at our 706/862 or 243/799 casting as they are better adapted to N/A and Nitrous applications.

Here is the 706/862 CNC link: CNC Ported 862/706 Heads | LM4/LM7 Cylinder Head Pair – Allied Motor Parts

Here is the 243/799 CNC link: LS1/LS6 CNC Ported 243 Heads & 799 Heads for sale – Allied Motor Parts

Equipped with .650 Springs and 2.02/1.59 Valves, these high-performance CNC 317 heads are meticulously crafted to surpass OEM specifications, guaranteeing top-notch quality and performance.

Ideal for engines from 1997-2004, our ported LS heads (part number ALL-65057PC) are perfect for LS powerplants. If you're seeking improved airflow, increased power, and overall performance enhancement, our 243 ported heads are the ultimate upgrade for your LS1 or LS6 engine.

Experience the outstanding value of our 317 heads for sale, engineered for superior airflow and precision. The CNC porting process ensures these heads are the best choice for any performance enthusiast looking to get the most out of their engine.

Upgrade today with our ported 317 heads and feel the power and performance boost in your LS6 engine. Discover the unrivaled quality and performance of our ported LS heads, the go-to choice for car enthusiasts around the globe.

Explore the comprehensive range of Cylinder head options available in our Chevrolet Cylinder Heads collection to ensure the perfect fit for your vehicle. Have queries? We're here to help you contact our expert support team today!

Contact our expert support team if you need help or have questions by using our contact form, calling 866-766-9955, or emailing  sales@alliedmotorparts.com. We're here to assist you throughout your journey. To get insights on cylinder heads, visit our blog.

Learn more about Chevrolet Cylinder Heads.

These Cylinder Heads have a core charge of $200.00 included in the cost. This charge is FULLY REFUNDED upon return. We will include a prepaid label for the return freight.

It is also important to review/confirm the fitment notes above to ensure the vehicle specifics of the head are correct for your application. If you have any questions that this may not be the correct head for your vehicle or need help in locating the correct head, please contact us via phone or email prior to making a purchase.

Check out Our Blog related to 243 Heads

Check out Our Blog related to 799 Heads