MAHLE 930221525 PowerPak Forged Piston & Ring Kit 427ci LS7 4.125" Bore Flat Top 4032

The MAHLE 930221525 PowerPak Piston and Ring Kit is a complete, race-proven forged piston assembly engineered for high-performance LS7-based engine builds. Designed for high-performance street, sportsman, and pro class racing applications, this kit delivers the precision, durability, and coating technology that MAHLE is known for across the world's premier racing series.

These forged flat-top pistons are manufactured from 4032 aluminum alloy, which provides tighter cylinder-to-wall clearances and improved temperature stability compared to standard alloys.

Technical Specifications:

• Displacement: 427 cubic inches
• Bore: 4.125"
• Stroke: 4.000"
• Rod Length: 6.067"
• Compression Height: 1.181"
• Pin Diameter: 0.927"
• Crown Volume: -3cc (Flat Top)
• Piston Weight: 454 grams
• Compression Ratio: 12.2:1
• Alloy: 4032 Aluminum
• Ring Grooves: 1.0mm x 1.0mm x 2.0mm

Key Features:

• Grafal Anti-Friction Skirt Coating: MAHLE's proprietary coating reduces drag, scuffing, friction, cylinder bore wear, and piston noise for extended engine life
• Phosphate Dry Lubricant Coating: Protects ring grooves and pin bores against micro-welding and pin galling during initial startup and break-in
• Hard Anodized Top Ring Grooves: Provides extra protection against ring groove micro-welding in extreme-duty applications
• Slipper Skirt Forging Design: Strong, lightweight, and low-drag — superior to traditional full-round designs
• Valve Reliefs: Designed to accommodate LS7-style cylinder heads
• Fully Machined Crown: Machineable crown allows for custom compression ratio adjustments
• Race-Proven: Hand-deburred for quality and consistency

The MAHLE 930221525 PowerPak kit is built for builders who demand precision and performance in every component. Whether for a naturally aspirated build or a power-adder application, these pistons deliver reliable performance backed by over 90 years of MAHLE motorsport heritage.