NGK Spark Plug Stock # 4629

The NGK Spark Plug Stock # 4629 (C7HSA) is an OEM-equivalent ignition component designed for reliable combustion performance in a variety of standard and lightly modified engines. This spark plug is ideal for those restoring classic vehicles, maintaining daily drivers, or tuning performance engines, ensuring dependable ignition and engine longevity.

Engineered with a ceramic insulator body, the C7HSA spark plug effectively manages heat ranges without fouling, making it suitable for both carbureted and early fuel-injected engines. Its design promotes efficient spark initiation and stable flame-front propagation, which are essential for maintaining timing stability across various RPMs. Additionally, NGK's proprietary construction helps resist carbon buildup and electrode erosion, ensuring gap integrity over extended use.

This spark plug is best suited for stock or mildly modified naturally aspirated engines, and it is recommended to avoid using it in forced induction applications without considering a colder range. Installation is straightforward, requiring gapping to the manufacturer's specifications, typically between 0.028" and 0.035" depending on the specific application. Mechanics and enthusiasts alike can trust NGK's reputation for performance and reliability.