GM LS Aluminum Straight Water Neck - Black

• Straight aluminum outlet connects LS thermostat housing to upper radiator hose

• Precise 2.970" bolt spacing matches LS thermostat housing mounting holes

• Fits GM LS Gen III/IV small block V8s — 4.8L through 6.2L (LR4 through LSA)

• Black finish; gasket/seal and thermostat not included — sold separately

This Straight water neck is designed to provide a secure coolant outlet connection between the engine and upper radiator hose. Its aluminum construction with a black finish supports reliable coolant routing while giving the engine bay a clean finished look.

Straight Outlet Configuration
The outlet angle helps route the upper radiator hose cleanly in performance, restoration, and custom cooling system layouts.

Secure Hose Connection
Designed to create a tight connection at the thermostat housing area to support reliable coolant flow and help reduce leak points.

Aluminum Construction
Built from aluminum to handle coolant system heat, pressure, and repeated service conditions.

Application-Specific Cooling Fitment
Designed for the listed engine family and sealing style, with fitment verified by the product dimensions and specifications.

What engines does this water neck fit?
This water neck fits GM Gen III/IV LS-based Small Block V8 engines from 4.8L through 6.2L, including LR4, LY2, LM7, L59, LM4, L33, LC9, LH6, LY5, LMG, LS1, LS6, LQ4, LQ9, LS2, LY6, L76, L96, LS3, L92, L99, and LSA applications.

Does this fit a Gen I small block or big block Chevy?
No — this water neck uses the LS-style thermostat housing bolt pattern and is not compatible with Gen I Small Block Chevy or Mark IV/Gen V/Gen VI Big Block Chevy thermostat housings.

Does this come with a gasket or thermostat?
No — the gasket and thermostat are sold separately. Both are required for a complete installation.

Does this water neck swivel for hose alignment?
No — this water neck has a fixed straight outlet and does not swivel. Verify your radiator-hose routing and clearance before installation.

What's the bolt spacing on this water neck?
The two mounting holes are spaced 2.970" center-to-center, matching the specified LS thermostat housing bolt pattern.

Will this fit an LS engine swap into a non-GM vehicle?
Yes — vehicle make doesn't determine fitment. It can be used in an LS swap as long as the engine and cooling-system configuration use the compatible 2.970" thermostat housing bolt pattern.

Is this a good fit for a truck or SUV cooling system rebuild?
Yes — it's suitable for compatible LS-powered truck and SUV cooling-system applications, including Silverado, Sierra, Tahoe, Suburban, and Yukon models. Verify the engine and thermostat housing configuration before ordering.