Michigan Motorsports LS Coolant Crossover Tube & Steam Port Cover Bolts | Set of 4 | OEM 11588714 | Fits 4.8L 5.3L 5.7L 6.0L 6.2L 7.0L LS1 LS3 LQ4 LM7 LC9 Engines

The Michigan Motorsports LS Coolant Crossover Tube / Steam Port Blockoff Bolts are a direct-fit replacement set for OEM part number 11588714. Sold as a complete set of 4 bolts, these fasteners secure the coolant crossover tubes or steam port blockoff plates on GM LS engines. Designed for 4.8L, 5.3L, 5.7L, 6.0L, 6.2L, and 7.0L platforms, including LS1, LS3, LQ4, LM7, and LC9, these bolts deliver factory-correct fitment and reliability. Perfect for rebuilds, maintenance, or replacing missing/damaged hardware, this set provides a durable and cost-effective solution with Michigan Motorsports quality.

• Complete Set of 4 Bolts – Includes four OEM-spec bolts to secure coolant crossover tubes or steam port blockoff plates, covering a full LS engine installation.
• Factory-Style OEM Replacement – Matches GM part number 11588714, ensuring correct fit, clamping force, and sealing performance for coolant system components.
• Critical Cooling System Hardware – Provides the proper fastener strength to keep crossover tubes and steam port blockoffs leak-free, helping maintain engine cooling efficiency.
• Ideal for Rebuilds & Repairs – Perfect solution when refreshing your LS engine, replacing missing hardware, or performing steam port modifications on performance builds.
• Wide LS Engine Compatibility – Fits a broad range of GM LS engines including LS1, LS3, LQ4, LM7, LC9, and other 4.8L–7.0L Gen III/IV platforms.