MAHLE 930266721T Forged Piston 445ci 4.221" Bore 2618 Alloy TBC Coated -7.8cc 12.0:1 CR

The MAHLE Motorsport 930266721T is a high-performance forged racing piston engineered for 445 cubic inch applications. Forged from 2618 aluminum alloy, this piston delivers exceptional detonation resistance and strength under extreme power and heat conditions — making it ideal for demanding circle track, drag racing, and high-output street/strip builds.

This piston features a 4.221-inch bore diameter, a 3.976-inch stroke compatibility, a 6.319-inch rod length, and a 0.990-inch wrist pin diameter. The -7.8cc dome volume yields a target compression ratio of 12.0:1, while the piston weighs in at a competitive 514 grams — keeping reciprocating mass in check at high RPM.

Key Features:

• 2618 Forged Aluminum Alloy — superior strength and detonation resistance for forced induction and high-compression applications
• TBC (Thermal Barrier Coating) on the crown — reduces heat transfer into the piston, improving combustion efficiency and protecting the piston from extreme temperatures
• 1.319-inch compression height — precision-machined for accurate deck clearance
• -7.8cc valve relief / dome volume — optimized for 12.0:1 compression ratio builds
• 514-gram piston weight — lightweight forging reduces reciprocating mass for improved throttle response
• Phosphate dry film lubricant — protects wrist pin bores and ring grooves during initial start-up and break-in
• Precision ring grooves machined to exacting tolerances for consistent ring seal and long service life

Specifications:

• Displacement: 445 CID
• Bore Diameter: 4.221 in.
• Compression Height: 1.319 in.
• Stroke: 3.976 in.
• Rod Length: 6.319 in.
• Pin Diameter: 0.990 in.
• Dome Volume: -7.8cc
• Piston Weight: 514g
• Compression Ratio: 12.0:1
• Alloy: 2618 Aluminum
• Crown Coating: TBC (Thermal Barrier Coating)

Backed by MAHLE Motorsport's decades of racing heritage — from Formula 1 to NASCAR championship-winning programs — every piston undergoes precision machining with close attention to ring groove quality, tolerances, and consistency for unmatched reliability on the track or strip.