1997-2004 C5 LS1 Engine Water Pump to Block Gasket – 12559648 - OEM Number(s) (12559648)
OE Gasket for LS1 Water Pump-to-Block Seal
Fix unwanted coolant leaks at the water pump flange with this GM-correct water pump gasket for 1997–2004 LS1-powered Corvettes. Designed for a precise seal between the pump and engine block, this die-cut composite gasket matches GM #12559648 and features proper port alignment and thickness for reliable, leak-free installation.
Whether you're replacing a pump or resealing a coolant seep, trust this OEM-style gasket to deliver the long-term reliability your LS1 deserves.
Features
• Fits 1997–2004 C5 Corvettes with LS1 engines
• Replaces GM part number 12559648
• Correct shape, port dimensions, and bolt spacing
• Die-cut for OE port alignment and sealing surface
• Sold individually—2 required per Corvette
Dimensions and Weight
• Bolt Centerline Width: 2-5/16"
• Total Height: 3-13/16"
• Water Port Opening: 1-3/4"
• Bypass Port Opening: 1-1/4"
• Gasket Thickness: 1/32"
• GM OE Number: 12559648
• Shipping Weight: 0.2 oz
Because Details Matter
Gaskets aren’t just fillers—they’re your engine’s frontline defense against coolant leaks. Mid America Motorworks delivers OE-level quality for a reliable seal where it counts.
Also known under these part numbers: (For reference only)