MAHLE 930229405 PowerPak LS 403ci Forged Piston Kit 4.005 Bore 4.000 Stroke 2618 Alloy

The MAHLE 930229405 PowerPak Piston Kit is a complete, race-proven forged piston assembly engineered for high-displacement GM LS-based engines. Displacing 403 cubic inches with a 4.005" bore and 4.000" stroke, this kit is purpose-built for high-performance street, sportsman, and pro-class racing applications.

Forged from 2618 aluminum alloy, these pistons are designed for maximum detonation resistance and durability under extreme cylinder pressures — making them the ideal choice for forced induction, nitrous, and high-compression builds. Each piston features a -14.0cc dish crown to achieve a 10.0:1 compression ratio (calculated at zero deck with a 0.040" head gasket), and is precision-machined to exacting tolerances.

Kit Specifications:

• Bore Diameter: 4.005"
• Compression Height (RCH): 1.110"
• Stroke: 4.000"
• Rod Length: 6.125"
• Wrist Pin Diameter: 0.927"
• Crown Volume: -14.0cc (dish)
• Piston Weight: 400g
• Compression Ratio: 10.0:1
• Alloy: 2618 Forged Aluminum
• Displacement: 403 CID

Key Features:

• Complete PowerPak kit includes hand-deburred forged pistons, high-quality steel wrist pins, round wire locks, and low-drag performance rings
• MAHLE Grafal® anti-friction skirt coating reduces friction and wear for extended piston life
• Phosphate dry lubricant coating on pin bores and ring grooves protects against galling and micro-welding during initial startup and break-in
• Machineable piston crown allows for custom compression ratio tuning
• Lightweight slipper skirt forging design for reduced reciprocating mass
• Compatible with LS1/LS2/LS6 cathedral port and LS3/L92 rectangular port cylinder heads (LSX combo pocket)

The MAHLE PowerPak 930229405 delivers the same forging quality and coating technology trusted by professional NASCAR and endurance racing teams, now available for engine builders constructing high-performance LS stroker combinations.