Spec Clutch SV87A-4 Lightweight Aluminum Flywheel SFI Certified

The Spec Clutch SV87A-4 is a lightweight, aircraft-quality billet aluminum flywheel engineered for high-performance and competitive driving applications. Constructed from premium aluminum billet material, this flywheel serves as a critical dual-mass to single-mass conversion component, replacing the OEM dual-mass flywheel design with a more performance-focused single-mass alternative.

Precision CNC Manufacturing:

SPEC flywheels are CNC machined to an industry-leading .001 inch tolerance — ten times tighter than the industry standard of .010 — guaranteeing a perfectly flat clutch bedding surface and true rotational balance. This level of precision eliminates dimensional runout, reducing engine-damaging vibrations and improving smooth, consistent engine revolutions at all RPM levels.

Key Features:

• Aircraft-quality billet aluminum construction for a super-lightweight rotating assembly
• CNC machined to .001 inch tolerance — the tightest in the industry
• SFI certified for use in competitive and sanctioned racing environments
• Rebuildable design with a replaceable steel friction plate for long service life
• Replaceable friction plate made from friction-enhancing steel formulated for optimum clutch bedding and holding power
• Optimized moment of inertia (MOI) to maximize throttle response and power delivery
• Converts OEM dual-mass flywheel to a high-performance single-mass design
• Compatible with SPEC Gran Am Cup design clutch kits (SPEC clutch kit required)

The flywheel is the single most important component in ensuring optimum clutch performance and longevity. It provides a consistent friction surface for the clutch disc, contributes the correct rotational inertia to balance power transfer and acceleration, and must maintain perfect balance at RPM to protect the engine and drivetrain. SPEC engineers extensive research and development into every flywheel's specific dimensions and weight to optimize MOI for each application and driving environment.

The SV87A-4 is designed and hand-built in the U.S.A., and is part of SPEC's line of tuned billet flywheels developed for specific driving environments — from performance street use to full competition racing.