Upgrade your 5.9L Cummins engine with our premium Fire Ring Gasket, specifically designed to handle high cylinder pressures. Ideal for both street performance and competition builds, this gasket offers superior sealing and durability—especially when paired with proper machining, studs, and installation techniques.
Gasket Specifications
- Thickness: .056″ (1.4 mm)
- Wire Size: .105″
- Bore Diameter: 4.560″
- Groove Radius: .0120″ radiused groove in the head to a depth of .032″–.033″
Recommended Installation Guidelines
1. Machining for Flatness
- For best results, have both the head and block machined to ensure a perfectly flat sealing surface.
- Engines under 800 HP: Cutting grooves in just the head
- Be sure to run 625 studs on vehicles over 800hp
2. Use a Radiused Cutter
- We strongly recommend a radiused cutter for all groove installations to achieve optimal sealing with the fire ring.
3. Proper Stud Installation & Lubrication
- Studs are a must for reliable clamping force—our competition gasket requires studs to handle elevated boost levels.
- Apply liberal lubrication on the nut, washer, and threads to ensure even clamp load.
- Never exceed manufacturer torque limits—fasteners at full torque contain immense potential energy.
4. Torque Procedure
- Initial Torque: 130 ft-lb for startup.
- Retorque Hot: After reaching operating temperature, retorque the studs while the engine is still warm.
- Check Valve Lash: Each retorque will further compress the gasket, affecting valve lash—always re-adjust as needed.
Why Choose Our Fire Ring Gasket?
- Engineered for High Cylinder Pressures: Superior sealing under extreme conditions.
- Long-Lasting Performance: Proven to handle high horsepower builds beyond 800 HP.
- Optimal Grooving & Clamping: Designed for precision machining and consistent stud clamp load.
- Enhanced Reliability: Reduce the risk of head-gasket failure in demanding diesel applications.
Please note that actual products may differ from images shown on our website. While we strive for accuracy in product listings, manufacturers may make changes to design, contents, color, or packaging without notice. Product images are for illustrative purposes only and may not represent the exact item you receive.
By purchasing, you acknowledge and accept that variations may occur and release OCDiesel from any liability related to product appearance differences.
Order Processing Time:
Orders are typically processed within 24-48 hours after the order has been placed.
Custom or special order items may take longer to process, typically 3-5 business days depending on the product and customization required.
Shipping Methods:
Standard Shipping (3-7 business days - location dependent)
Express Shipping (1-2 business days- location dependent)
Packaging:
All parts are securely packaged to better prevent any damage during transit. Fragile or high-value parts will be packaged with additional protective materials, such as bubble wrap or foam padding.
Shipping Rates:
Shipping rates vary based on the size, weight, and destination of the package. You can view the estimated shipping costs for your order during the checkout process before placing your order.
Order Tracking:
Once your order has been shipped, you will receive an email with the tracking number and carrier information. You can also track your order status by logging into your OCDiesel account.
USA Shipping:
We ship to the USA! (Except California) Please note that USA shipping rates and delivery times may vary based on destination. Customers are responsible for any customs fees, import taxes, or additional charges that may apply.
Not all products are stocked in-house. To ensure you receive your desired items promptly, please check for availability before placing your order. Some products may be backordered due to high demand or supply chain constraints, which could result in longer delivery times.
We strive to keep our inventory updated regularly, but availability can change quickly. For the most accurate information, contact the OCDiesel customer service team using either this link, or the chat bubble on the bottom right of this page.
Most items are eligible for return within 30 days of shipping, provided they are unused, in original manufacturer packaging, and in resalable condition. All returns & cancellations are subject to restocking and cancellation fees.
Returns must include a Return Authorization Number (RA #) and be shipped with tracking. Return shipping costs are the responsibility of the customer.
Custom/special orders, electronics, and digital goods are final sale—no returns, refunds, or exchanges.
For full return instructions, fee details, and conditions, click here.
