551275 Cylinder Head Dowel Alignment Pin Set 4 Piece | Direct Replacement Fit for Gen 3 4 5 GM LS LT Engines (LS1 LS3 LS2 LT1 LT4) & LS Swap Engine Rebuild

Product information: 551275 Cylinder Head Dowel Alignment Pins Compatible with Gen 3 Gen 4 Gen 5 LS/LT Series Engines, 4-pack. Dimensions: The dowel pin has a diameter of 0.65 inches and a length of 0.58 inches Product function: 1. Precise Alignment: Ensures precise alignment between the cylinder head and the engine block during installation, preventing sealing issues caused by misalignment. Precise alignment helps ensure the correct sealing of the cylinder head gasket, preventing coolant, oil, and combustion gas leaks. 2. Improved Engine Performance: Precise alignment ensures the combustion chamber is correctly positioned, thereby enhancing combustion efficiency and improving engine performance and fuel efficiency. 3. Preventing Mechanical Damage: Avoids engine mechanical failures caused by misalignment, extending the engine's lifespan Installation Steps: 1. Before installation, ensure that the engine is disconnected from power and in a stable condition. 2. Locate the dowel pin holes on the engine block and insert the new dowel pins into the holes. 3. When installing the cylinder head, ensure that the dowel pins guide the cylinder head into correct alignment. 4. After installation, check that the cylinder head is properly aligned and that all connections are secure Compatibility: Suitable for Gen 3, 4, and 5 LS/LT series engines, including LT, LSX, LS1, LS2, LS3, LQ4, LQ9, LS6, L92, L99, L33, LR4, L82, L83, L84, L86, L87, LT1, L8B, and more Precautions: Safety: Always ensure the engine is disconnected from power during the operation to avoid the risk of electric shock. Refer to the Manual: If possible, refer to the engine's user manual or the manufacturer's compatibility list After-sale service: We will provide you with quality and performance guarantees. If you have any questions about our products, please feel free to contact us. We are happy to assist you and enhance your shopping experience

• Replacement Part Number 551275: This 4-piece cylinder head dowel alignment pin set is precision machined steel, fit for GM LS/LT engines, directly replacing worn, rusted or missing original dowel pins to ensure accurate cylinder head and engine block alignment during installation
• Wide Compatibility: Fit for all Gen 3, 4, 5 GM LS/LT V8 engines including LS1, LS2, LS3, LS6, LS7, LQ4, LQ9, LR4, L33, LT1, LT4, L82, L83, L86, L87, L8B, as well as LSX and LS-based high-performance engines, compatible with Vortec 5.3L 6.0L 6.2L
• Multiple Application Scenarios: Ideal for LS Swap projects, engine rebuilds, cylinder head replacement, head gasket replacement, engine restoration and high-performance racing engine construction, effectively preventing gasket failure and compression loss by ensuring precise alignment
• Key Specifications: Made of high-grade steel with rust-resistant surface treatment, 0.625" (5/8") outer diameter, 0.500" (1/2") height, precision tolerance control, fit for direct replacement for GM dowel pins (fit for GM 12570326, 12558081 equivalents), enough for 2 cylinder heads
• Perfect Fit & Easy Installation: Fit for all vehicles equipped with LS/LT engines (fits for Corvette, Camaro, Silverado, Tahoe, Escalade, GTO) and third-party LS/LT cylinder heads, requires cleaning of dowel pin holes and light lubrication before installation to avoid damage