Wiseco PTS501A4 Pro Tru Street Forged Piston Set Ford 351 4.040in Bore Flat Top -7cc

The Wiseco PTS501A4 Pro Tru Street Forged Piston Set delivers race-proven forged performance for Ford 351 Windsor-based engine builds at a street-friendly price point. Forged using Wiseco's near-net-shape forging process, these pistons are crafted from 4032 aluminum alloy — a material with 12–13% higher silicon content than standard 2618 alloy — allowing for tighter piston-to-wall clearances of just 0.003 inches for quieter operation, especially during engine warm-up.

Each kit is manufactured entirely in-house at Wiseco's Mentor, Ohio facility using the latest CNC equipment, ensuring tight tolerances and consistent quality from raw bar stock to finished, skirt-coated parts. The near-net-shape forging technique forms valve pockets and dome geometry during the forging process itself, reducing CNC machining time and keeping costs down without sacrificing structural integrity.

Key Features:

• Forged 4032 aluminum alloy construction — higher silicon content for improved wear resistance and tighter fitment
• Near-net-shape forging process reduces machining for a strong, lightweight piston at an affordable price
• Flat top dome design with -7cc dome volume
• Bore Size: 4.040 inches
• Compression Height: 1.769 inches
• Stroke: 3.500 inches
• Rod Length: 5.954 inches
• Pin Diameter: 0.912 inches
• Compression Ratio: 9.7:1 (64cc chamber) / 10.3:1 (58cc chamber)
• Displacement: 359 cubic inches
• Ring grooves sized for 1/16, 1/16, 3/16-inch ring package
• Replacement ringset: S100S8-4040-5 (included)
• Kit includes pistons, pre-fit rings, wrist pins, and locks
• Made in the USA

The Pro Tru Street series is engineered for mild to moderate performance street builds, striking the ideal balance between durability and performance without the cost premium of full race-spec components. This piston set is an excellent choice for engine builders looking to upgrade to forged pistons in a Ford 351-based stroker or rebuilt application.