Wiseco PTS522A7 Chevy Big Block 4.320 Bore 21cc Dome Forged Piston Set

The Wiseco PTS522A7 is a forged piston set designed for Chevrolet Big Block engines, featuring a 21cc dome combustion chamber design and a 4.320-inch bore diameter with a 1.270-inch compression height. Wiseco's Pro Tru Street (PTS) pistons are manufactured using high-strength forged aluminum alloy, delivering superior durability and thermal performance over cast alternatives.

Key Features:

• Application: Chevrolet Big Block (BBC) engines
• Bore Size: 4.320 inches
• Compression Height: 1.270 inches
• Dome Volume: 21cc positive dome for increased compression ratio
• Construction: Forged aluminum alloy for maximum strength and durability
• Series: Pro Tru Street (PTS) — engineered for high-performance street and mild racing applications
• Finish: Precision CNC-machined for consistent sizing and ring seal

Wiseco's Pro Tru Street pistons are a popular upgrade for enthusiasts building or rebuilding high-compression Big Block Chevy engines. The 21cc dome helps achieve elevated compression ratios, making this set well-suited for performance street builds, hot rods, and bracket racing applications. Each piston is manufactured to tight tolerances for reliable ring seal and long service life.