GM LS Aluminum Straight Water Neck - Chrome

• 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)

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

This straight aluminum water neck creates the coolant outlet connection between the LS thermostat housing and upper radiator hose, with a chrome finish that gives the engine bay a clean, finished look. The 2.970" bolt hole center-to-center spacing matches the LS thermostat housing's two-bolt mounting pattern, and mounting hardware is included.

This water neck is built for GM LS Gen III/IV small block V8 engines only — 4.8L (LR4, LY2), 5.3L (LM7, L59, LM4, L33, LC9, LH6, LY5, LMG), 5.7L (LS1, LS6), 6.0L (LQ4, LQ9, LS2, LY6, L76, L96), and 6.2L (LS3, L92, L99, LSA). It is not compatible with Chevy Gen I small block or Mark IV/Gen V/Gen VI big block engines, which use a different thermostat housing design.

A gasket or seal, and a thermostat, are not included with this water neck — source a compatible thermostat housing gasket separately before installation. This outlet does not swivel; hose alignment is fixed at installation.

Engine Applications
Fits GM LS Gen III/IV small block V8s across the common displacement range — 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L — covering engine codes from the LR4 and LY2 through the LS3, L92, L99, and LSA. Commonly used in Silverado, Sierra, Tahoe, Suburban, Yukon, Camaro, Corvette, and LS-equipped GTO/G8 applications running the factory LS thermostat housing bolt pattern.

Installation
Confirm your thermostat housing uses the standard 2.970" bolt hole spacing before ordering. Since a gasket or seal isn't included, source a compatible thermostat housing gasket separately, and since this outlet doesn't swivel, plan hose routing before final torque — the outlet angle is fixed once installed.

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.