Dropping an LS into something it never came in usually means the radiator inlet has moved, and the factory neck points the hose the wrong way. This straight neck gives you a clean, known outlet position, and the slotted mounting holes let it bolt to any year LS cover rather than one specific casting.

Mr. Gasket 2671NA GM LS Water Neck Features:

• Straight style water neck for GM LS series engines.
• Revised design with slotted mounting holes.
• Fits 1-1/2 in. radiator hose.
• Must be used with a 2004-2008 style thermostat, such as Mr. Gasket 6367 at 160 degrees or 6368 at 180 degrees.
• Stainless steel mounting bolts included.
• Polished aluminum finish to match polished accessory drive brackets.
• Suited to engine swap applications.
• Sold individually.