Product Description
Michigan Motorsports Block Coolant Port Plug
Fits 1997–Newer GM LS-Based Engines | 4.8L, 5.3L, 5.7L, 6.0L & 6.2L | Replaces GM 12561663
The Michigan Motorsports Block Coolant Port Plug is a direct-replacement solution for sealing the large coolant drain port located in GM LS engine blocks. Machined from durable bronze, this plug is commonly used when removing factory block heaters or oil coolers, or when replacing an original steel plug that has corroded over time. Designed with a 28mm x 1.25 thread and a 17mm hex, it installs easily and provides a reliable, leak-free seal for long-term service on stock and performance LS engines.
Key Features & Benefits
- Prevents Coolant Leaks at the Block Drain Port: Designed to seal the large coolant drain opening in LS engine blocks, eliminating leaks caused by worn or corroded factory plugs.
- Ideal for Block Heater or Oil Cooler Removal: Commonly used during engine swaps, rebuilds, or clean-up installs where factory block heaters or oil cooler fittings are removed.
- Corrosion-Resistant Bronze Construction: Bronze material resists rust and corrosion better than factory steel plugs, ensuring long-term sealing reliability.
- Precision OEM-Style Threading: Features a 28mm x 1.25 thread with a 17mm hex for easy installation and proper torque without damaging the block.
- Direct Replacement for GM 12561663: Drop-in replacement that restores factory sealing without modification, ideal for maintenance or engine refresh projects.
Key Fitments (Gasoline V8 Models)
- Buick Rainier: 2004–2006
- Cadillac CTS-V: 2004–2015
- Cadillac Escalade: 2002–2014
- Chevrolet Avalanche 1500: 2002–2013
- Chevrolet Camaro: 1998–2015
- Chevrolet Corvette: 1997–2013
- Chevrolet Express 1500: 2003–2014
- Chevrolet Express 2500: 2003–2014
- Chevrolet Express 3500: 2001–2014
- Chevrolet Silverado 1500: 1999–2013
- Chevrolet Silverado 2500: 1999–2019
- Chevrolet Silverado 3500: 2001–2019
- Chevrolet SSR: 2003–2006
- Chevrolet Suburban 1500: 2000–2014
- Chevrolet Tahoe: 2000–2014
- GMC Envoy: 2003–2006
- GMC Savana 1500: 2003–2014
- GMC Savana 2500: 2003–2014
- GMC Savana 3500: 2001–2014
- GMC Sierra 1500: 1999–2013
- GMC Sierra 2500: 1999–2019
- GMC Sierra 3500: 2001–2019
- GMC Yukon: 2000–2014
- Hummer H2: 2003–2006
- Isuzu Ascender: 2003–2006
- Pontiac Firebird: 1998–2002
- Pontiac GTO: 2004–2006
- Saab 9-7X: 2005–2006
