Enginetech P5012(6) | Dome Top Hypereutectic Pistons for 02-06 GM 4.2L/254 L6 | Coated Skirt | 1.189" Compression Height | 0.50mm Oversized Enginetech Premium Quality Piston Sets for All Your Engine Needs. Discover unparalleled performance and durability with our top-of-the-line Piston Sets. Crafted using the latest in engineering technology, these pistons are designed to meet and exceed original equipment (OE) specifications, ensuring a perfect fit and exceptional functionality for your engine. Advanced Materials & Construction Each piston set is made from high-quality materials, including cast aluminum, hypereutectic, and forged applications.