For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition
65 WarningService Prior to Assembly
Dirt will cause premature wear of the rebuilt engine. Cleanall the components.Use the proper tools to measure the components when checkingfor excessive wear. Components not within the manufacturer'sspecification must be repaired or replaced.When the components are reinstalled into an engine, returnt ...