Harmonic Balancer Bolt Replacement for GM LS Engines -

Harmonic Balancer Bolt Replacement for GM LS Engines - Replaces 12557840 - Crankshaft Pulley Damper Bolt for Gen 3 Gen 4 LS1 LS2 LS3 LS6 LQ4 LQ9 4.8L 5.3L 5.7L 6.0L 6.2L V8
- ✅ WIDE COMPATIBILITY FOR GM LS ENGINES: Fits almost all Gen 3 and Gen 4 LS-based V8 engines from 1997-2014. Compatible with Chevy Silverado, Tahoe, Corvette, Camaro, GMC Sierra, and more. Fits engine codes: LS1, LS2, LS3, LS6, LS7, L92, L99, LQ4, LQ9, LM7, L33, L59, LY5, LMG, LH6, LC9.
- 🔧 CRITICAL TORQUE-TO-YIELD (TTY) DESIGN: Just like the factory GM part, this bolt is designed to stretch when tightened to provide maximum clamping force. NOTE: This is a "One-Time Use" bolt. It must be replaced every time the harmonic balancer is removed for a cam swap, oil pump upgrade, or timing chain service. Never reuse an old crank bolt!
- ⚙️ OEM PART REPLACEMENT: Precision engineered to replace GM Part Number 12557840. Features the correct M16 x 2.0 thread pitch and heavy-duty flange head design to securely lock the crankshaft pulley (damper) in place under high RPMs.
- 🛡️ HIGH-STRENGTH STEEL: Manufactured from heat-treated high-tensile steel to withstand the immense torque required for installation (typically 37 ft-lbs plus 140 degrees, check your service manual). Prevents the pulley from wobbling or coming loose.
- 📦 ESSENTIAL FOR CAM SWAPS: If you are upgrading your cam or servicing the front main seal on a 4.8L, 5.3L, 5.7L, 6.0L, or 6.2L engine, this new bolt is mandatory. Do not risk your engine build with a used, stretched bolt.
Country USA
Brand RMSPO
Manufacturer RMSPO
ItemPartNumber 12557840
Model 12557840
Warranty 2 Year Manufacturer
UnitCount 1
ReleaseDate 0000-00-00

Country	USA
Brand	RMSPO
Manufacturer	RMSPO
ItemPartNumber	12557840
Model	12557840
Warranty	2 Year Manufacturer
UnitCount	1
ReleaseDate	0000-00-00

Harmonic Balancer Bolt Replacement for GM LS Engines - Replaces 12557840 - Crankshaft Pulley Damper Bolt for Gen 3 Gen 4 LS1 LS2 LS3 LS6 LQ4 LQ9 4.8L 5.3L 5.7L 6.0L 6.2L V8

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