{"product_id":"5238-racing-spark-plug","title":"5238 Racing Spark Plug","description":"The NGK 5238 is a racing spark plug specifically engineered for the demands of high-performance engines. Its non-resistor design and nickel tip and center electrode contribute to optimal spark delivery under extreme conditions. The pure alumina silicate ceramic insulator offers enhanced strength and superior heat transfer capabilities, while the copper core further aids in heat dissipation. Corrugated ribs are integrated to prevent flashover, and triple seals ensure reliable performance by preventing leakage.\n\nThis spark plug features a V-cut center electrode with a 2.5mm size and a non-projected type. The terminal type is solid, and it uses a gasket seat. With a 14mm thread diameter, 1.25mm thread pitch, and a 19mm (3\/4\") reach, it is designed for a secure fit. The hex size is 5\/8\" (16mm).\n\nNGK explicitly states that this spark plug is not intended for standard road vehicles. While some cross-references suggest compatibility with specific applications like the Chevrolet Corvette 5.7L V8 from 1986-1991, the primary designation is for motorsport use. Modifications may be needed for non-racing applications.\n\nKey specifications include a heat range of 9, a thread size of M14 - 1.25, and a gap of 0.8mm (0.031\"). Torque specifications are provided for cast iron (18-25.3 lb. ft.) and aluminum (18-21.6 lb. ft.) heads. The recommended longevity is approximately 30,000 miles.","brand":"NGK","offers":[{"title":"Default Title","offer_id":52663099982136,"sku":"NGK 5238","price":7.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687073910.jpg?v=1784323810","url":"https:\/\/store.motormia.co\/products\/5238-racing-spark-plug","provider":"MOTORMIA","version":"1.0","type":"link"}