Wiseco PTS509A6 Pro Tru Street Forged Piston Set Chevy 350 4.060 Bore Reverse Dome -15cc

The Wiseco PTS509A6 is a complete Pro Tru Street forged piston set engineered for Chevy 350 small block stroker applications. Forged from 4032 aluminum alloy, these pistons feature a higher silicon content that allows for tighter piston-to-wall clearances of approximately 0.003 inches, promoting quieter operation — especially during engine warm-up — compared to traditional 2618-alloy forged pistons.

Using Wiseco's near-net-shape forging process, the valve pockets and reverse dome profile are formed during the forging stage itself, minimizing costly CNC machining time and delivering a strong, lightweight piston at an accessible price point. Each piston features Wiseco's proprietary ArmorGlide skirt coating for reduced friction, improved piston life, and tighter dimensional tolerances. Oversized, symmetrical, radiused valve pockets accommodate oversized valves and high-lift camshafts, making this set well-suited for mild to moderate street performance builds.

Key Specifications:

• Piston Style: Reverse Dome
• Bore Size: 4.060 in.
• Compression Height: 1.260 in.
• Stroke: 3.480 in.
• Rod Length: 6.000 in.
• Pin Diameter: 0.927 in.
• Dome Volume: -15cc
• Compression Ratio: 8.9:1 (67cc chamber) / 9.2:1 (64cc chamber) / 9.8:1 (58cc chamber)
• Displacement: 360 cubic inches
• Ring Package: 1/16 in. x 1/16 in. x 3/16 in. (included)
• Replacement Piston P/N: 5509A6
• Ring Set P/N: S100S8-4060-5

Each kit includes a complete ring package, wrist pins, and locks — everything needed for a full piston installation. Manufactured in the USA, the PTS509A6 delivers genuine forged piston quality and durability for street-driven small block Chevy builds without the premium price of race-oriented piston lines.