This steam vent adapter kit eliminates trapped air and steam from the engine to prevent hot spots and overheating, giving LS engine swaps a cleaner look than OEM rigid hard lines while adding flexibility for aftermarket intakes and accessories.
Specifications:
- Adapter Type: LS Steam Tube Vent Adapter
- Finish: Black
- Hose Size: 4 AN
- Material: Aluminum / Rubber
- Design: Adjustable, pivoting steam vent adapters
- Warning: California Proposition 65
- Part Number: 26-550
This kit connects to the front steam outlets on the cylinder heads only. Use two GM OEM steam tube block-off plugs (GM # 12602540) on the rear of the cylinder heads.
FAQ
Which steam outlets does the 26-550 kit connect to?
It provides adapters and hose for the front steam outlets on the cylinder heads only.
What do I do with the rear steam outlets?
Block them off using two GM OEM steam tube block-off plugs (GM # 12602540).
Why use this kit instead of factory hard lines?
It gives LS engines a cleaner, more custom look than OEM rigid hard lines and adds flexibility when using aftermarket intakes or accessories.
What hose and hardware does it include?
Black push-on or stainless braided speed-flex hose, hose ends, and adjustable pivoting steam vent adapters.

