Sportsman Racing Products 138086 SBC Flat Top Forged Piston Set, 4.040-Inch Bore, -5cc, Set of 8

Upgrade your small block Chevy engine with the Sportsman Racing Products 138086 forged flat top piston set. Designed for 350 applications, this set includes eight pistons engineered for dependable performance in demanding street, strip, and competition builds. The 4.040-inch bore size supports precise fitment for compatible engine configurations, while the forged construction provides strength and durability under high-cylinder-pressure conditions.
The flat top design features a -5.00 cc volume and a 1.260-inch compression height, helping builders establish the desired compression ratio when matched with the appropriate cylinder heads, gaskets, connecting rods, and crankshaft. Each piston is machined with 1/16-inch, 1/16-inch, and 3/16-inch ring grooves for use with compatible piston ring sets. Verify all clearances, compression calculations, and component compatibility before installation.
Sportsman Racing Products part number 138086 is supplied as a complete set of eight pistons for small block Chevy engines. The pistons are intended for applications using a 4.040-inch bore and should be professionally installed with proper piston-to-wall clearance, ring end gap, deck height, and valve clearance specifications. This set provides a practical foundation for rebuilding or upgrading a compatible 350-based performance engine.

Features:

• Brand: Sportsman Racing Products

• Part Number: 138086

• Application: Small block Chevy 350 engines

• Construction: Forged aluminum

• Piston Style: Flat top

• Bore Size: 4.040 inches

• Compression Height: 1.260 inches

• Piston Volume: -5.00 cc

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

• Quantity: Set of 8