{"product_id":"ngk-v-power-ur4-spark-plugs-8-pack-shorty-resistor-heat-range-4-for-1988-1991-chevrolet-corvette-5-7l-350","title":"NGK V-Power UR4 Spark Plugs 8-Pack — Shorty Resistor, Heat Range 4 for 1988–1991 Chevrolet Corvette 5.7L\/350","description":"\u003cp\u003e\u003cstrong\u003eNGK V-Power UR4 spark plugs (8-pack) are replacement shorty resistor plugs designed to fit 1988–1991 Chevrolet Corvette 5.7L\/350 engines, offering reliable ignition performance for V8 small-block Chevy applications.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you need a direct-fit spark plug for a Gen I Chevy small-block 5.7L\/350 used in late‑80s and early‑90s Corvettes, NGK’s V-Power UR4 delivers a balance of dependable spark and value. These are sold as an eight-pack and are configured as shorty plugs with an integrated resistor and a manufacturer heat range of 4, engineered for standard ignition systems found in that era of Chevrolet performance engines.\u003c\/p\u003e\n\n\u003ch3\u003eWill these plugs fit my 1988–1991 Corvette 5.7L\/350?\u003c\/h3\u003e\n\u003cp\u003eYes — the UR4 specification matches the factory-type short reach and resistor requirements for Chevy small-block Gen I 5.7L engines from those model years. They are made to be a like-for-like replacement without modification.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eApplication: Chevrolet Corvette 1988–1991, 5.7L\/350 V8\u003c\/li\u003e\n  \u003cli\u003eEngine family: Chevy small block Gen I compatibility\u003c\/li\u003e\n  \u003cli\u003ePhysical type: shorty spark plug with resistor\u003c\/li\u003e\n  \u003cli\u003eSold quantity: eight plugs per pack for complete V8 coverage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do NGK V-Power UR4 plugs affect everyday driving?\u003c\/h3\u003e\n\u003cp\u003eThese plugs deliver stable ignition under normal driving and light performance conditions, helping maintain consistent starts and throttle response. They are positioned as economical replacements that retain expected engine behavior for street-driven Corvettes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConsistent spark for smooth idle and steady throttle\u003c\/li\u003e\n  \u003cli\u003eResistor design reduces radio interference and electrical noise\u003c\/li\u003e\n  \u003cli\u003eHeat range 4 tuned to common small‑block operating temperatures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key specs and installation considerations?\u003c\/h3\u003e\n\u003cp\u003eUR4 plugs are short-reach designs, so thread engagement and seat type match factory expectations; torque to manufacturer specifications during installation. Use an appropriate socket and anti-seize only if recommended by engine builder; verify gap if your application requires a non-standard setting.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eManufacturer heat range: 4\u003c\/li\u003e\n  \u003cli\u003eShorty spark plug length (short reach)\u003c\/li\u003e\n  \u003cli\u003ePre‑set\/gapped for typical factory ignition, check before fitting if modified\u003c\/li\u003e\n  \u003cli\u003eSold in an eight‑piece set to replace all cylinders on V8 engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long can I expect these plugs to last?\u003c\/h3\u003e\n\u003cp\u003eService life depends on driving conditions, ignition system health, and fuel quality; under normal street use they typically provide reliable service for thousands of miles. Inspect plugs during routine tune-ups and replace sooner if signs of fouling or wear appear.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurability influenced by driving style and engine condition\u003c\/li\u003e\n  \u003cli\u003eInspect at regular maintenance intervals for fouling or gap erosion\u003c\/li\u003e\n  \u003cli\u003eReplace the set to preserve consistent firing across all cylinders\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This NGK V-Power UR4 8-pack is intended for owners, restorers, and DIY mechanics working on 1988–1991 Chevrolet Corvette models equipped with the 5.7L\/350 V8 (Chevy small block Gen I). It suits drivers wanting a cost-effective, OEM-style replacement plug set that maintains factory fit and function for street-driven cars and light performance use.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these NGK UR4 plugs the correct fit for a 1990 Corvette 5.7L?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The UR4 shorty resistor plugs match the factory specifications for 1988–1991 Corvette 5.7L\/350 small‑block engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these plugs come pre-gapped?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They are packaged to typical factory gap specifications, but it's wise to check and adjust the gap before installation if your engine requires a custom setting.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48085967700126,"sku":"B07R7S2GDV","price":51.71,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-v-power-front-packaging_03d9ac3a-1450-449d-bda3-075c098c6fd0.jpg?v=1785881780","url":"https:\/\/northtrailauto.ca\/products\/ngk-v-power-ur4-spark-plugs-8-pack-shorty-resistor-heat-range-4-for-1988-1991-chevrolet-corvette-5-7l-350","provider":"North Trail Auto","version":"1.0","type":"link"}