Spec Clutch SF64A Billet Aluminum Flywheel SFI Certified - 6-Bolt 1.1

The Spec Clutch SF64A is a CNC-machined billet aluminum flywheel engineered for high-performance and racing applications. Machined to an industry-leading .001" tolerance — ten times tighter than the industry standard of .010" — this flywheel delivers exceptional rotational balance, a perfectly flat clutch disc bedding surface, and the precision required for serious performance driving.

Constructed from aircraft-quality billet aluminum, the SF64A is approximately half the weight of a comparable stock cast steel flywheel. This significant reduction in rotating mass translates directly to faster engine revving, quicker throttle response, and reduced parasitic drag between the crankshaft and the drivetrain. SPEC engineers each flywheel for specific vehicle applications and driving environments — this is not a generic lightweight flywheel, but a purpose-engineered component optimized for the vehicle's unique moment of inertia (MOI) requirements.

Key Features:

• Aircraft-quality billet aluminum construction — significantly lighter than OEM cast iron or steel units
• CNC machined to .001" tolerance — 10x tighter than the industry standard for superior balance and runout elimination
• SFI 1.1 certified — meets safety standards for high-performance and competitive racing environments
• Replaceable steel friction plate — rebuildable design with a friction-enhancing steel surface formulated for optimum clutch bedding and holding power
• 164-tooth ring gear — diaphragm pressure plate compatible
• 14.240" flywheel diameter
• 6-bolt crankshaft mounting
• 12 lbs. weight
• Made in the USA — designed, tested, and manufactured in-house by SPEC

The SF64A is a rebuildable flywheel with a replaceable steel friction plate, making it a long-term investment in drivetrain performance. Whether used on the street, autocross course, drag strip, or road track, the SPEC SF64A delivers the precision balance and surface quality needed to maximize clutch performance and service life.