03413B Exhaust Manifold Header Bolts Hardware Kit Grade 10.9 Compatible with LS1 LS2 LS3 LS6 LS7 LSX GM Vortec 4.8L 5.3L 6.0L 6.2L Replaces 11518860 11609481 (12 Pack)

03413B Exhaust Manifold Header Bolts Hardware Kit Compatible with Select Models LS1 Header Bolts LSX LS2 LS3 LS6 LS7 GM Vortec 4.8L 5.3L 6.0L 6.2L Replaces 11518860 11609481 (12 Pack) Grade 10.9 M8 x 1.25 30mm Zinc Plated

• 【Grade 10.9 High Strength Construction】Manufactured from high-strength Grade 10.9 alloy steel, this exhaust manifold bolt kit provides superior durability compared to standard hardware. Each bolt is rated to withstand the extreme thermal cycling and vibration of high-performance LS engines, delivering reliable long-lasting performance.
• 【Precision Fit for Select GM LS & Vortec Engines】Compatible with LS1, LS2, LS3, LS6, LS7, LSX, and GM Vortec 4.8L, 5.3L, 6.0L, 6.2L engines. Replaces part numbers 03413B, 11518860, 11609481. Please verify your vehicle application before purchasing.
• 【Complete 12-Piece Set】This kit includes 12 exhaust manifold header bolts, providing all the hardware needed for a full replacement on most LS and Vortec applications. Each bolt features M8 x 1.25 thread with 30mm under-head length and zinc-plated finish for corrosion resistance.
• 【Engineered for Reliable Replacement 】Whether you are dealing with broken, stripped, or corroded original bolts, this kit offers a dependable replacement solution. The Grade 10.9 construction provides enhanced strength over factory hardware, reducing the risk of future breakage.
• 【Professional Installation Recommended】For optimal results, use medium-strength threadlocker (Loctite 242/blue) and torque to 18 ft lbs. If unsure about installation or vehicle compatibility, please consult a professional mechanic or contact us for assistance.