Mahle 930221535 PowerPak Forged Piston Kit LS7 4.135 Bore Flat Top Set of 8

Vehicle Fitment

GM LS7 7.0L Engine Applications (427-430 Cubic Inches)
2006-2013 Chevrolet Corvette Z06 (C6)
2009-2015 Cadillac CTS-V (Manual Transmission)
Custom LS Engine Builds

Fitment Notes

• Designed for LS7-style cylinder heads
• 4.135" bore - verify block bore size before ordering
• 4.000" stroke / 6.067" rod length configuration
• 11.8:1 compression ratio with 70cc combustion chambers
• Drop-in replacement for stock LS7 bore size
• File-fit rings included - requires ring gap fitting
• Professional engine builder installation recommended

Features

• Forged 4032 low-expansion aluminum alloy construction
• Flat top design with -2.5cc dome volume
• Grafal anti-friction skirt coating reduces drag and wear
• Phosphate dry lubricant coating on crown and ring grooves
• Forced pin oiling for improved wrist pin lubrication
• CNC precision-machined pin bores
• Hand-deburred for race-quality finish
• Complete drop-in piston assembly
• Over 80 years of Mahle piston manufacturing expertise

Specifications

• Brand: Mahle Motorsports
• Part Number: 930221535
• Product Line: PowerPak
• Engine Family: GM LS7
• Displacement: 430 Cubic Inches
• Bore: 4.135 Inches
• Stroke: 4.000 Inches
• Rod Length: 6.067 Inches
• Dome Style: Flat Top
• Dome Volume: -2.5cc
• Compression Ratio: 11.8:1 (with 70cc Heads)
• Material: Forged 4032 Aluminum Alloy
• Piston Weight: 452 Grams (Advertised)
• Pin Diameter: 0.927 Inches
• Pin Weight: 118 Grams
• Pin Type: Full Floating with Round Wire Locks
• Ring Widths: 1.0mm / 1.0mm / 2.0mm
• Skirt Coating: Grafal Anti-Friction
• Crown Coating: Phosphate Dry Lubricant
• Quantity: Set of 8 Pistons

Included Components

• Mahle PowerPak forged pistons (8)
• Performance piston ring set (8)
• High-quality steel wrist pins (8)
• Round wire pin locks (16)

Product Description

The Mahle 930221535 PowerPak Piston Kit delivers race-proven performance for GM LS7 engine builds requiring a complete, ready-to-install forged piston assembly. Developed for high-performance street, sportsman, and pro-class racing applications, this kit includes everything needed except ring gap fitting to complete your rotating assembly. Each piston is forged from 4032 low-expansion aluminum alloy, providing the strength necessary for high-output naturally aspirated and power-adder applications while maintaining tighter piston-to-wall clearances than conventional 2618 alloy pistons. The flat top design with -2.5cc dome volume produces an 11.8:1 compression ratio when paired with 70cc cylinder heads, ideal for premium pump gas or race fuel applications. Mahle applies dual performance coatings to every piston: a phosphate dry lubricant protects against ring micro-welding and pin galling during initial startup, while the proprietary Grafal anti-friction coating on the skirts reduces drag, wear, scuffing, and piston noise throughout the engine's service life. With over 80 years of piston manufacturing experience spanning OEM production to Formula 1 racing, Mahle brings unmatched expertise to every PowerPak kit.