Wiseco K0166X155 Ford 302/351 Windsor Flat Top Forged Piston Kit 4.155in Bore TFS Twisted Wedge

The Wiseco K0166X155 is a Professional Series forged flat top piston kit engineered specifically for Ford 302/351 Windsor small block engines built with TFS (Trick Flow Specialties) Twisted Wedge cylinder heads.

Forged from 2618 high-strength aluminum alloy, these pistons are machined in the USA and feature a 4.155-inch bore, 1.280-inch compression height, and a -7.5cc flat top crown — optimized for stroker combinations running a 4.000-inch stroke and 6.200-inch rod length. Valve pocket dimensions of .350/.250-inch are specially designed to clear the angled valve arrangement of TFS Twisted Wedge heads without sacrificing compression or flow.

Key Features:

• 2618 High-Strength Forged Alloy — superior strength for high-output and power-adder applications
• ArmorGlide® Skirt Coating — reduces friction, resists seizure, and quiets piston operation
• Premium GFX Ring Set Included — 1.2mm / 1.2mm / 3.0mm ring package included with kit
• Anti-Detonation & Pressure Seal Grooves — engineered to maintain ring seal under high-compression conditions
• .350/.250-inch Valve Pockets — designed for TFS Twisted Wedge head compatibility
• Strutted Skirt Design — optimized strength-to-weight profile for performance use
• .927 x 2.500-inch Wrist Pin Included — Pin Part #S424 included in kit
• -7.5cc Flat Top Crown — yields approx. 12.3:1 CR at 60cc combustion chamber (0 deck / .040 gasket)

Compression Ratio Reference (at 0 deck with .040-inch head gasket):

• 54cc chamber: 13.2:1
• 58cc chamber: 12.6:1
• 60cc chamber: 12.3:1
• 62cc chamber: 12.0:1

Build Specifications: Bore 4.155in | Compression Height 1.280in | Stroke 4.000in | Rod Length 6.200in | Wrist Pin .927 x 2.500in | Crown Volume -7.5cc | Skirt Type: Strutted

This kit is offered as a build-on-demand product. Wiseco's Professional Series SBF pistons are the preferred choice for builders seeking a high-quality forged piston with all performance features ready out of the box.