MAS Ignition Coil Pack Set of 6 for 4.2L L6 GM & Isuzu Engines UF303/C1395 — Direct-Fit, Corrosion-Resistant

MAS Set of 6 Ignition Coil Packs is a complete replacement kit engineered to restore reliable spark delivery for compatible 4.2L L6 GM and Isuzu engines.

This set provides six direct-fit coil packs designed to match or improve on original equipment specifications for a full-coil replacement. Built with corrosion-resistant materials and high electrical insulation, the MAS coils are intended for drivers who need a straightforward swap to eliminate misfires, rough idle, or loss of power associated with failing coils. The package covers common fitments across several Chevrolet, GMC, Buick, Oldsmobile, Saab and Isuzu models using the UF303 / C1395 family of parts.

What vehicles and part numbers do these coil packs fit?

These coils are made to replace factory parts used on many GM-derived 4.2L inline-six vehicles and corresponding Isuzu models. They accept the same mounting and electrical connections as the original units for a hassle-free replacement.

• Compatible vehicles: 2002–2005 Chevrolet Trailblazer (including EXT), 2004–2005 Buick Rainier, 2002–2005 GMC Envoy (including XL and XUV), 2003–2008 Isuzu Ascender, 2002–2003 Oldsmobile Bravada, 2005 Saab 9-7X.
• Cross-referenced part numbers: UF-303, UF303, C1395, 12568062, 5c1392, E255, IC414 and others in that family.
• Designed for 4.2L L6 engines that use the listed OEM references.

How do these coils improve engine performance and reliability?

Each MAS coil is manufactured with high-grade materials to deliver consistent electrical resistance and strong spark energy under load. Replacing worn coils helps reduce misfires and can restore smoother idling and throttle response without altering engine tuning.

• High electrical insulation maintains spark stability across temperature ranges.
• Corrosion- and abrasion-resistant housings for longer service life.
• Matched electrical characteristics to OEM specs for predictable operation.

Is installation straightforward and what should I expect?

Installation follows the same steps as the factory coils: disconnect battery, remove ignition harness and hold-downs, swap coils, then reconnect. No special programming is typically required; the coils are plug-and-play for compatible ECUs.

• Complete set of six coils replaces all cylinders in one service interval.
• Standard hand tools and basic mechanical skills are sufficient.
• Torque the coil fasteners to factory specs and inspect connectors for corrosion.

Which durability and quality features does MAS include?

MAS emphasizes robust construction and quality control so each coil resists common failure modes like moisture intrusion and thermal fatigue. Materials and molding processes are chosen to perform in under-hood conditions typical of the listed vehicles.

• Premium-grade polymers and high-resistance windings to withstand heat cycles.
• Sealed coils to limit moisture ingress and electrical leakage.
• Tested to meet or exceed typical OE performance for fit and function.

Who is this for: The MAS Set of 6 Ignition Coil Packs is intended for DIY mechanics, independent shops, and owners of compatible Chevrolet, GMC, Buick, Oldsmobile, Saab and Isuzu models who want a full-coil replacement to resolve misfires, rough idle, or intermittent ignition faults. Choose this kit when you need an all-six replacement that aligns with UF303/C1395 OE references and offers durable materials for consistent on-road performance.