Product Description
Genuine GM 12602540 Coolant Steam Port / Air Bleed Block Off Plug
Fits Front and Rear Coolant Steam Ports on All LS-Based V8 Cylinder Heads
The Genuine GM 12602540 Coolant Steam Port / Air Bleed Block Off Plug is the factory-correct solution for sealing the unused coolant steam ports on GM LS cylinder heads. Designed to fit the front or rear ports of any LS-based V8, this OEM plug ensures a leak-free seal and maintains optimal coolant system performance.
Constructed from durable steel and featuring a precision-fit O-ring seal, this plug provides long-lasting corrosion resistance and reliable operation even under high heat and pressure. It’s ideal for LS swap applications, custom builds, or repairs where unused ports need to be securely blocked off.
*Sold individually or as a pair, this Genuine GM part guarantees the same quality, fit, and durability as your vehicle’s original equipment.
Key Features:
- Genuine GM OEM part – part number 12602540
- Compatible with all GM LS-series engines
- Can be installed on the front or rear coolant steam ports
- Durable steel construction with corrosion-resistant finish
- Includes pre-installed O-ring for a reliable, leak-free seal
- Perfect for LS swap applications or replacing missing/damaged plugs
- Available in single (1) or pair (2) options
Fits the Following LS Engines:
- LS1, LS2, LS3, LS6, L99, LSA, L92, L9H, L94, L76, L77
- LY6, L96, LFA, LZ1, LY5, LMG, LMF, LH6, LC9
- LY2, L20, L33, LQ4, LQ9, LR4, LM7, L59, LS4, LH8, LH9
