RAM Clutches 1550 LS 6 Bolt Street Performance Steel Flywheel

RAM billet steel flywheels deliver the uncompromising performance and long term reliability required for modern street performance applications. Each flywheel is precision machined, surface ground, and dynamically balanced to exacting tolerances, ensuring a perfect fit right out of the box. The robust steel construction provides the ideal inertia for smooth launches and exceptional low speed drivability.

Designed for performance enthusiasts, engine builders, and swap specialists, RAM steel flywheels feature a serviceable ring gear and meet all SFI safety specifications. Application specific options support popular engine swap platforms—including LS, LT, Coyote, and Hemi—as well as Tremec transmission conversions. Whether upgrading for street performance, track use, or a custom build, RAM delivers the premium flywheel solution trusted by professionals. RAM billet steel flywheels are engineered and manufactured in the USA. When only the best will do- Choose RAM.

• Fits GM LS applications 1997-2015
• Center hole diameter 2.070 (1 pc rear main seal)
• Internal balance
• 168 tooth ring gear
• Clutch bolt patterns: GM metric diaphragm 11 7/8" clutches with 12.625" bolt circle, 10mm – 1.5 thread, GM 11", 12" clutches with 12.625" bolt circles, 3/8-16 thread
• 0.815" thickness crank flange to friction surface
• Meets SFI 1.1 specifications

The RAM Clutches 1550 steel flywheel fits 1997-2015 GM LS-engine applications (Gen III/IV) with a 6-bolt crankshaft, 168-tooth ring gear, and 1-piece rear main seal. It is designed for LS1, LS2, LS3, LS6, LS7, and LS9 engines This will not fit 1999-2000 6.0L applications with 0.400 in. extended crank flange.

Engine/Years: 1997–2015 GM LS-based engines.

Components: 168-tooth, 6-bolt pattern, 1-piece rear main seal, internally balanced.

Common Applications: 98-02 Camaro/Firebird, 97-13 Corvette, 04-06 GTO, 04-07 CTS-V, 10-15 Camaro.

Terms and Policy (PDF)

• Fits GM LS applications 1997-2015
• Center hole diameter 2.070" (1 pc rear main seal)
• Internal balance
• 168 tooth ring gear
• Clutch bolt patterns:
• GM metric diaphragm 11-7/8" clutches with 12.625" bolt circle, 10mm-1.5 thread
• GM 11", 12" clutches with 12.625" bolt circles, 3/8-16 thread
• 0.815" thickness crank flange to friction surface
• 28 pounds
• Meets SFI 1.1 specifications
• Made in the USA
• Flywheel bolt set: 528
• Pressure plate bolt set (3/8"-16): 490
• Pressure plate bolt set (10mm-1.5): 531