Wiseco PTS509A3 Pro Tru Street Forged Pistons Chevy 350 4.030" Bore Reverse Dome

The Wiseco PTS509A3 Pro Tru Street Forged Pistons are purpose-built for the Chevy 350 small block engine, delivering the strength and precision of a forged piston in a package engineered for street performance applications. Featuring a reverse dome (dish) design with a -15cc dome volume, these pistons are optimized to work with a variety of combustion chamber sizes to achieve target compression ratios for reliable, streetable power.

Wiseco's Pro Tru Street series combines aerospace-quality forged aluminum construction with tight manufacturing tolerances, resulting in a piston that outperforms cast alternatives in durability, heat resistance, and overall longevity — making them an ideal upgrade for both mild street builds and more aggressive street/strip combinations.

Key Specifications:

• Application: Chevy 350 Small Block
• Bore Size: 4.030"
• Compression Height: 1.260"
• Stroke: 3.480"
• Rod Length: 6.000"
• Pin Diameter: 0.927"
• Dome Volume: -15cc (Reverse Dome / Dish)
• Compression Ratio: 8.8:1 (with 67cc chamber) / 9.6:1 (with 58cc chamber)
• Cubic Inches: 355 CID

Construction & Features:

• Forged aluminum construction for superior strength over cast pistons
• Pro Tru Street series designed for street and mild performance use
• Precision machined to tight tolerances for consistent ring seal and reduced blow-by
• Reverse dome (dish) crown promotes efficient combustion and manageable compression ratios
• Compatible with standard 350 small block rotating assembly dimensions

Sold as a set, the Wiseco PTS509A3 pistons are a trusted choice for Chevy 350 engine builders looking for a reliable, forged piston upgrade that delivers lasting performance on the street.