Upgrade your 12V Cummins (1989–1998) with our Fire Ring Gasket, engineered for reliable sealing under high boost and extreme horsepower. At .080″ thickness (1.8 mm) and 4.560″ wire O.D., this gasket is built to handle the stress of performance applications.
Gasket & Groove Specifications
- Thickness: .080″ (1.8 mm)
- Wire O.D.: 4.560″ (using .105″ wire)
- Groove depth: .016″–.017″ depth in cylinder head with a .120″ radius cutter
Recommended Installation Steps
1. Surface Preparation
- Machine Block & Head: Achieve maximum flatness for a proper seal—especially important if pushing horsepower beyond 800 HP.
- Grooves:
- Engines under 800 HP: Cut groove in just the cylinder head
- Engines over 800 HP: make sure you use a high tensile ARP 625 fastener
- Radiused Cutter: Always recommended for precise groove formation and the best gasket-to-wire contact.
2. Studs Are Essential
- Use Quality Studs: Ensure proper clamp load, vital for high-performance diesel applications.
- Generous Lubrication: Coat nuts, washers, and threads thoroughly to guarantee even torque across all studs.
- Manufacturer Torque Limits: Never exceed them—fasteners at full torque store significant potential energy.
3. Torque Procedure
- Initial Torque: 130 ft-lbs before first startup.
- Hot Retorque: After reaching operating temperature, retorque while the engine is still warm.
- Check Valve Lash: Each retorque compresses the gasket further, reducing valve lash—readjust as needed.
Why Choose Our Fire Ring Gasket?
- High-Horsepower Ready: Built to withstand demanding performance applications beyond 800 HP.
- Precision Engineering: .080″ thickness, radiused grooves, and .105″ wire for optimal sealing.
- Enhanced Reliability: Reduce the risk of head gasket failure with proper studs and consistent clamp load.
- Backed by Expertise: Trusted by diesel enthusiasts who demand durability and performance.
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.
