The ACDelco 41-902 (GM Part Number 19300875) is a premium GM Original Equipment (OE) Double Platinum Spark Plug. Formerly appearing under the ACDelco Professional label, it is engineered for older General Motors engines that require robust platinum performance

Key SpecificationsAs confirmed by technical product sheets on AutoZone and automotive listings on eBay, the mechanical layout includes:Electrode Type: Double platinum pads on both the center electrode and ground electrode.Core Design: Pure copper core for efficient cooling and high fouling resistance.Thread Size & Reach: 14mm thread diameter with a 17.5mm (0.689 inch) reach.Seat Type: Tapered / Conical seat (does not require a crush washer).Hex Size: 16mm (5/8 inch).Factory Pre-Gap: Boxed with a wide gap of 0.060 inches (~1.5 mm) typical for vintage Vortec platforms.Common Vehicle CompatibilityThe 41-902 plug fits an extensive roster of GM passenger cars, trucks, and SUVs from the late 1980s through the 2000s. According to application catalogs on Newparts.com, its most notable engine fitments include:GM Vortec 5.0L & 5.7L V8 Engines (1996–2002): Found in the Chevrolet Tahoe, Suburban, Silverado, and GMC Sierra C1500/K1500.GM 3.8L V6 Engines (1988–2005): Found in the Buick LeSabre, Buick Riviera, Buick Regal, and Pontiac Bonneville.GM 3.1L & 3.4L V6 Engines: Distributed widely across models like the Chevrolet Malibu, Monte Carlo, and Venture vans.