NGK 7588 Spark Plug

NGK Iridium IX Spark Plug 7588

NGK Iridium IX Spark Plug 7588 is built for older Chevrolet, GMC, Oldsmobile, and Pontiac applications that call for a 14 mm tapered-seat plug with a 0.060 in pre-gap. It combines an iridium center electrode with a nickel ground electrode and a copper core to support stable ignition performance in classic V8 and inline applications.

Key Features

• Iridium center electrode tip material for precise spark delivery
• Copper center electrode core material for efficient heat transfer
• Nickel ground electrode core material with standard ground configuration
• Taper cut ground electrode tip design
• Pre-gapped at 0.060 in for listed applications
• 5 k? resistance and non-removable nut terminal type
• 14 mm thread diameter, 0.46 in reach, tapered seat
• NGK part number 7588, manufacturer reference YR55IX

Product Details

As part of the NGK Iridium IX Spark Plug line, this plug is engineered around a fine iridium firing tip and OE-focused construction. NGK has a long history as a major original-equipment supplier in North America, and that experience shows in the fit, materials, and application coverage of this spark plug. For buyers searching for NGK 7588, YR55IX, or an Iridium IX spark plug for classic Chevrolet C10, GMC Jimmy, or Pontiac Firebird applications, this part matches the listed California-emissions and HEI-era requirements shown in the fitment data.

This part cross-references NGK 7588 for the same application.

What It Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Misfire concerns from eroded electrode tips
• Rough idle in older Chevrolet and GMC ignition systems
• Weak spark performance in high-mileage classic engines
• Maintenance replacement for vehicles calling for a 0.060 in gap

Installation Notes and Tips

Verify the vehicle’s required heat range, seat type, thread diameter, and reach before installation. The listed applications include 1974-1978 Chevrolet and GMC trucks, vans, and passenger vehicles, plus 1975 Oldsmobile Cutlass, Cutlass Supreme, Omega, and 1975 Pontiac Firebird, Grand LeMans, and LeMans. Fits 1975 Chevrolet C10, N/A; Fits 1977-1978 Chevrolet K5 Blazer, N/A; Fits 1977-1978 GMC Jimmy, N/A. Set the gap to the application specification when required, and confirm the ignition system condition before final assembly.

Quality Assurance

NGK manufactures spark plugs for domestic and import vehicles and supports OE-level standards across its ignition product range. The 7588 Iridium IX spark plug reflects that OE supplier background with application-specific construction and broad coverage for classic GM platforms.