Wiseco PTS516A7 Pro Tru Street Forged Piston Kit Big Block Chevy 454 Flat Top 4.320 Bore -3cc

The Wiseco PTS516A7 is a Pro Tru Street Series forged piston kit designed for Big Block Chevy 454 engines. Built on an open-chamber, flat-top design with a -3cc valve relief volume, this kit delivers a compression ratio of 8.8:1 with a 112cc combustion chamber — making it an ideal choice for performance street and street/strip builds.

Wiseco forges these pistons from 4032 aluminum alloy, a high-silicon material that minimizes thermal expansion for tighter piston-to-wall clearances, quieter cold starts, and improved wear resistance over the life of the engine. The as-forged crown includes oil drain backs for reliable lubrication management under sustained performance use.

Key Features:

• Bore: 4.320 in.
• Compression Height: 1.270 in.
• Stroke: 4.250 in.
• Rod Length: 6.385 in.
• Pin Diameter: 0.990 in.
• Crown Volume: -3cc (flat top, open chamber)
• Compression Ratio: 8.8:1 (at 112cc chamber)
• Displacement: 498 cubic inches
• Material: 4032 forged aluminum
• Replacement Piston P/N: 5516A7
• Ring Set Included: 4320H
• ArmorGlide proprietary skirt coating — reduces friction and stabilizes piston in the bore
• Chromium alloy steel piston pin and Spirolox retainers included
• Oversized, symmetrical, radiused valve pockets accommodate oversized valves and high-lift cams
• Complete kit includes pistons, rings, pins, and clips
• Build on Demand — assembled to order

Wiseco's ArmorGlide skirt coating is applied to every Pro Tru Street piston as standard. This OEM-type bonded coating reduces friction, improves lubricity, and helps stabilize piston motion through bottom dead center where rocking loads are highest. The included ductile plasma-moly ring set is matched to the 4.320 in. bore for a complete, ready-to-install package.