The Melling MWP-503 is a mechanical water pump for GM LS car applications including the Corvette, Pontiac G8 and Cadillac CTS from 2004 to 2009. It is built as an original-equipment-style replacement for the engine cooling system on these LS-powered vehicles.
Specifications:
- Type: mechanical water pump
- Engine family: GM LS, Corvette, G8 and CTS
- Application: 2004-2009 Corvette, Pontiac G8 and Cadillac CTS
- Part number: MWP-503
FAQ
Which vehicles does the Melling MWP-503 fit?
It is designed for GM LS applications including the Corvette, Pontiac G8 and Cadillac CTS from 2004 to 2009.
Is the MWP-503 a mechanical water pump?
Yes. It is a belt-driven mechanical water pump built as an original-equipment-style replacement.
Does the MWP-503 fit trucks?
No. This part number is for the Corvette, G8 and CTS car applications; GM LS truck and SUV applications use other Melling water pumps.

