OEM Part Numbers & Brand Reliability: Features OEM-compatible part numbers 12557840 and 917-139, for precise fit and optimal performance in GM harmonic balancer systems.
Wide Fitment for GM LS Engines: Specifically engineered for all Gen.3 and Gen.4 LS engines, including LS1, LS2, LS3, LS6, L59, L92, L96, L99, LC9, LH8, LMF, LMG, LY5, LM7, LR4, LQ4, LQ9 (4.8L, 5.3L, 5.7L, 6.0L, 6.2L). Excludes LS7 and LS9 models for clear compatibility.
Premium 10.9 Grade High-Strength Steel: Constructed from durable, heat-treated steel with a Grade 10.9 rating, offering superior tensile strength to resist breakage, deformation, and heavy-duty engine vibrations.
Corrosion-Resistant & Precise Design: Features a M16 x 2 thread with a 4.05-inch underhead size and anti-corrosion Dacromet coating, ensuring long-lasting use in harsh engine environments.
Effortless Installation: Direct replacement for factory bolts, designed for straightforward installation without special tools—perfect for DIY enthusiasts and professional mechanics seeking quick, reliable repairs.