Description: 4.8, 5.3 & 6.0L. 5.3l. Corvette. 2nd design. 5.7L, without locating tab. Hummer H2. CTS. 5.7l. SSR. GTO. Sends signals to the engine control module (ECM) to adjust timing
Helps prevent damage to the engine caused by pre-ignition

Description: All models. 8.1l. All models. 4.3l. S-series. 4.3l. Astro, Safari. 4.3l. 6 cylinder. Code Yfky Yfpz Yfyy. 5.3L. 5.7L. GTO. This part requires programming and/or special setup procedures GM Service Information describes the procedures and special tools needed to ensure proper operation in the vehicle Dictates the operation of your vehicle's vital systems, which is critical to the performance of your vehicle

Description: Helps keep engine timing and fuel injection running in sync\
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Helps provide proper alignment, positioning, and spacing for easy installation\
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Synchronizes engine valves and pistons for excellent engine performance\
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This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

Description: Helps keep engine timing and fuel injection running in sync
Helps provide proper alignment, positioning, and spacing for easy installation
Synchronizes engine valves and pistons for excellent engine performance