LS Cylinder Head Plug M12-1.5 Built To Last For Coolant Temperature Sensor Hole, Fits GM LS1 LSX LS3 Engines 1997-2014, Billet Aluminum Plug With Sealing Washer, Coolant Port Plug For Head, Made In USA Aerospace Grade 551158

Premium M12-1.5 LS Cylinder Head Coolant Plug Aluminum
✔️ 1x billet aluminum plug with sealing washer, M12-1.5, USA made

This high-grade coolant port plug seals unused GM LS cylinder head coolant holes for LS1/LSX/LS3 engines. It’s a handy part for engine builds, head work, and sensor relocation tasks, keeping cooling paths leak-free. Made in Wichita, Kansas from aerospace-grade billet aluminum for durability and long life.

✅ Includes: 1 aluminum plug and 1 sealing washer
✅ Thread: M12-1.5 for GM LS coolant holes
✅ Compatibility: all GM LS Series engines 1997-2014
✅ Material/Finish: aerospace-grade billet aluminum, natural color, USA made

💡 What is a cylinder head coolant plug used for in GM LS engines?

A handy, general solution for sealing unused coolant passages during LS engine builds:

- Seals off coolant holes in cylinder heads during port work - Prevents leaks and keeps the cooling system tight under load - Works with M12-1.5 threaded LS engines from 1997-2014