12 PCS Header Bolts, 5.3/6.0 LS Engine Exhaust Manifold Bolts Fastener, M8x1.25x25mm Stainless Steel Exhaust Manifold Bolts Kit, Compatible with GM LS1 LS3 LS2 LSX LT Series, OE 551696

Product Item: Header Bolts● OE 551696 replacement for GM LS LT engines● M8×1.25×25mm Grade 10.9 carbon steel bolt● Black coated surface slows oxidation● 12-piece manifold-to-head mounting setFeatures:▲ Grade 10.9 carbon steel keeps structural form through repeated engine heat cycles▲ Black coating helps slow surface oxidation on bolt head and threadsFunction:▲ Helps fasten the exhaust manifold and engine block closely together▲ Helps keep the exhaust assembly stable to support normal gas circulation▲ Serves as a replacement for aged, fractured, and missing original mounting boltsSpecification:★ Material: Grade 10.9 Carbon Steel★ Thread Size: M8 × 1.25 × 25mm★ Replaces OE: 551696★ Color: Black★ Quantity: 12 PCS★ Application: Compatible with GM LS LS1 LS2 LS3 LSX LT Series 1997 and LaterPackage Includes:12 × Header Bolts

• Bolt Replacement Fit: This header bolt kit replaces OE part number 551696. It fits GM LS and LT series engines from 1997 and later, covering models like LS1, LS2, LS3, LS6, LSX, and LT1.
• Exhaust Manifold Fastening: This engine exhaust fastener bolt works to secure the manifold tightly against the cylinder head. It helps maintain a reliable connection under the stress of continuous engine heat cycles and vehicle vibration, supporting exhaust flow.
• Bolt Dimensions: This header gasket hardware is engineered to M8 x 1.25mm thread specifications with a 25mm length. These dimensions allow the bolt to integrate with the factory bolt pattern on specified GM LS and LT engine series.
• Grade 10.9 Carbon Steel Build: This bolt hardware kit is manufactured from Grade 10.9 carbon steel, a material chosen to handle repeated thermal expansion in the engine bay. The applied black coating assists in slowing surface oxidation on the bolt head and threads over time.
• 12-Piece Manifold Set: This replacement bolt kit contains 12 individual bolts, covering the exhaust manifold mounting points for most compatible GM V8 applications. They can be used as direct substitutes for the manifold bolts on various Chevrolet and GMC vehicles that use this specification.