Description

RK Fire Ring installation is a precision-machined process that enhances head gasket sealing by cutting custom grooves into the engine block and seating fire rings that bite into the head during torque-down. Designed specifically for B58 and S58 engines, this service prepares your block for extreme combustion pressure and eliminates the risk of sealing failure.

Each service includes groove machining for six fire rings, matched to inline-6 BMW engine specs.

Whether you’re pushing 800+ WHP or simply want bulletproof reliability, fire-ringing is a proven solution trusted in both street and race environments. This process is performed in-house using CNC equipment and the same standards we apply to our full engine builds.

Please note: This listing is for installation labor only. Fire Ring hardware must be purchased separately. Order the kit here:
RK Autowerks B58 & S58 Engine Fire Rings

Key Features:

• CNC groove machining for six fire rings

• Precision resurfacing of the engine block

• Improves sealing for high-boost and high-compression builds

• Minimizes blow-by, head lift, and gasket failure

• Designed for B58 and S58 platforms

• Professional install using in-house equipment and standards

Technical Specifications:
Service Type: Fire Ring Groove Machining + Block Resurfacing
Parts Included: None – customer must supply or purchase fire rings
Turnaround Time: 3–5 business days once block is received
Requirements: Engine block must be shipped to RK facility

Applications:
Compatible With BMW Engines:
B58 – G20 M340i, G87 M240i, A90 Supra, G30 540i, etc.
S58 – G80 M3, G82 M4, G87 M2, F97 X3M, F98 X4M

Installation and Support:
All machining is performed in-house at our Fort Worth facility using CNC equipment. This service is available for shipped-in engines. Please ensure your block is clean and stripped before sending. Additional cleaning fees may apply if prep is required.

Why Choose RK Autowerks:
Every service we offer is backed by real-world testing and performed with the same precision we demand in our own 1000+ WHP engine builds. We don’t outsource or cut corners — just proven methods and tight tolerances that hold under pressure.

Warranty:
RK Autowerks Warranty And Legal