BC8287 – Polaris RZR Pro-R (93.5mm x .088”) Cometic Head Gasket

In the high-stakes arena of performance UTV racing and built motors, the integrity of your engine’s combustion seal is non-negotiable. For owners and builders of the formidable Polaris RZR Pro-R and its potent 2.0L ProStar engine, the Brian Crower BC8287 head gasket represents the definitive solution. This isn’t a standard replacement part; it’s a purpose-built, Cometic MLS (Multi-Layer Steel) gasket engineered to withstand the extreme cylinder pressures and thermal cycles generated by forced induction, high-compression builds, and sustained high-RPM operation. With precise dimensions of 93.5mm bore x .088″ thickness, it is the critical component that transforms engine potential into reliable, leak-free power.

Engineering Superiority: The Cometic MLX Construction

Ordinary head gaskets fail under the duress of a modified Pro-R engine. The BC8287 utilizes Cometic’s advanced MLX (Multi-Layer Xtreme) technology, a construction that sets the benchmark for aftermarket sealing. This gasket features multiple layers of 301 stainless steel, each professionally coated with a proprietary Viton® rubber-based sealant. This coating is torqued-activated, meaning it flows microscopically to fill the intricate machining grooves on your cylinder head and block deck, creating a perfect, custom-conforming seal. Unlike composite gaskets that can extrude or blow out, the MLS design provides exceptional resilience to pressure pulsation and detonation. The layers act independently, allowing for differential thermal expansion between the aluminum head and block, virtually eliminating the risk of seeping or failure due to thermal stress—a common Achilles’ heel in performance UTV applications.

Critical Dimensions for the Polaris ProStar 2.0L Engine

Precision is paramount. The specified 93.5mm bore diameter is engineered to perfectly match common overbore configurations for the RZR Pro-R’s cylinders, ensuring the fire ring sits snugly around the piston without overhang or excessive gap that could create a hot spot. The .088-inch (2.24mm) compressed thickness is a critical data point for any serious builder. This thickness directly impacts your engine’s quench, or squish, area and, consequently, your final compression ratio. Maintaining the correct deck clearance is essential for optimizing combustion efficiency and controlling detonation, especially in turbocharged or supercharged applications. Using this exact-thickness gasket preserves your engine builder’s careful calculations for piston-to-head clearance, ensuring performance and safety are not compromised.

Unmatched Benefits for Your Performance Build

• Extreme Pressure & Heat Resistance: The 301 stainless steel layers and Viton® coating withstand combustion pressures exceeding 2,000 psi and temperatures over 1,800°F, far beyond the capability of OEM composites.
• Superior Seal Integrity: MLS construction prevents leaks of combustion gases, coolant, and oil, even on decks with moderate surface finish (RA 50 or finer), protecting your investment.
• Optimal Compression Control: The consistent .088″ thickness allows builders to accurately calculate and set final compression ratios, critical for forced induction and nitrous oxide applications.
• Unrivaled Durability & Reusability: Properly installed on a correctly prepared surface, an MLS gasket like the BC8287 can often survive multiple teardowns, unlike single-use OEM gaskets.
• Compatibility with Performance Mods: Designed explicitly for engines running increased boost, higher compression pistons, aggressive camshafts, and race fuel, making it the go-to for stage 2 and stage 3 builds.

Technical Specifications & Vehicle Fitment

This gasket is not a universal fit. It is a precision component designed for specific, high-performance applications of the Polaris ProStar engine family.

Detailed Vehicle Fitment

Primary Application: Polaris RZR Pro-R (2022+) with the 2.0L ProStar engine. It is also the correct upgrade for any build utilizing this engine platform where cylinder boring has been performed up to 93.5mm. It is essential to verify your engine’s exact bore size and deck surface condition before installation. This gasket is ideal for vehicles with aftermarket forged pistons, upgraded turbo systems, and competition tuning. For a deeper technical understanding of MLS gasket technology and surface preparation, which is crucial for a successful installation, refer to this authoritative resource on engine building best practices.

Installation Protocol for Maximum Performance

The superiority of the BC8287 gasket is fully realized only with meticulous installation. The deck surface of both the cylinder head and engine block must be inspected for absolute flatness (within 0.002″ per foot) and finished to a surface roughness (RA) of 50 microinches or finer. A coarse finish will prevent the MLS layers from sealing properly. All old gasket material must be removed. Follow the manufacturer’s specific torque sequence and torque-to-yield (TTY) specifications for your cylinder head bolts or studs. A proper break-in procedure, allowing the engine to go through multiple heat cycles, is recommended to let the Viton® coating fully set. Neglecting these steps is the primary cause of failure, even with the best components.

The Final Word for Pro-R Builders

Selecting the Brian Crower BC8287 Cometic Head Gasket is a decision that prioritizes longevity, power, and precision. For the enthusiast pushing their Polaris RZR Pro-R beyond factory limits—whether on the dunes, the trails, or the race course—this component is the bedrock of engine reliability. It bridges the gap between the immense forces created by modern performance modifications and the structural integrity of the ProStar block. Don’t let an inferior seal be the weak link in your high-horsepower equation. Invest in the gasket engineered to contain your engine’s true potential.