Sportsman Racing Products 139477 BBC Flat Top Forged Pistons, 4.280-Inch Bore, -3 cc, Set of 8

The Sportsman Racing Products 139477 piston set is designed for Big Block Chevy applications requiring durable, performance-focused forged pistons. Each piston features a flat-top crown and supports a 4.280-inch bore with a 1.645-inch compression height, making this set suitable for engine builds where consistent fitment and reliable operation are essential. The -3 cc piston volume can help builders achieve the desired compression ratio when matched with the appropriate cylinder head, gasket, and deck configuration.
Manufactured from forged material, these pistons are built to withstand the demanding conditions associated with high-performance engine use. The flat-top design provides a straightforward combustion-chamber interface and allows flexibility when selecting compatible cylinder heads and valvetrain components. This Sportsman Racing Products set includes eight pistons for a complete Big Block Chevy engine build or refresh.
The pistons use 1/16-inch, 1/16-inch, and 3/16-inch ring grooves for compatibility with corresponding compression and oil ring packages. Verify bore size, compression height, ring selection, piston-to-wall clearance, connecting rod specifications, and final compression ratio before installation. Professional measurement and assembly practices are recommended to ensure proper engine performance and durability.
Designed for enthusiasts, engine builders, and performance applications, the Sportsman Racing Products 139477 set combines a flat-top forged construction with specifications tailored to Big Block Chevy platforms. Match all piston and rotating assembly specifications to the intended engine combination before ordering.

Features:

• Brand: Sportsman Racing Products

• Part Number: 139477

• Application: Big Block Chevy

• Piston Type: Flat-top forged piston

• Bore: 4.280 inches

• Compression Height: 1.645 inches

• Piston Volume: -3 cc

• Ring Grooves: 1/16 inch, 1/16 inch, and 3/16 inch

• Quantity: Set of 8