Wiseco PTS521A6 Pro Tru Street Big Block Chevy 502 Dome Forged Piston Set 4.530 Bore

The Wiseco PTS521A6 is a Pro Tru Street series forged piston set designed for Chevrolet Big Block 502 applications.

Key Specifications:

• Bore: 4.530 in.
• Compression Height: 1.270 in.
• Stroke: 4.250 in.
• Rod Length: 6.385 in.
• Dome Volume: 15.0cc
• Pin Diameter: 0.990 in.
• Compression Ratio: 11.1:1 (at 112cc combustion chamber) / 10.5:1 (at 119cc)
• Displacement: 548 cubic inches
• Ringset Included: S100S8-4530-5
• Replacement Piston P/N: 5521A6

Key Features:

• 4032 Forged Aluminum construction for superior strength and durability
• ArmorGlide® Skirt Coating — Wiseco's proprietary coating that extends piston life, reduces friction, decreases noise, and allows tighter dimensional tolerances than standard spray-on coatings
• Oversized, symmetrical, radiused valve pockets for maximum flow during overlap and compatibility with oversized valves and high-lift cams
• Precision finished pin bores with pin oilers
• Plasma moly rings (1/16", 1/16", 3/16") included
• Chromium alloy steel piston pin and Spirolox included for a complete, all-inclusive rebuild kit

Manufactured at Wiseco's 150,000+ sq. ft. facility in Mentor, Ohio, the Pro Tru Street series delivers genuine performance-grade forged piston quality at an accessible price point. This is a Build on Demand item — please allow additional lead time for production.