SBC FT Cast Piston 4.020 Bore

The SBC FT Cast Piston 4.020 Bore is a purpose-built replacement piston designed for small block Chevy engines requiring precise bore sizing and reliable compression. As a cast iron piston, it delivers the durability and thermal stability needed for street engines, truck applications, and moderate-performance builds where affordability meets dependability. This piston is ideal for engine builders and mechanics restoring or upgrading SBC powerplants that demand OEM-quality fitment without premium pricing.

Cast construction provides excellent heat dissipation and resists scuffing under normal operating loads, making it a proven choice for naturally aspirated small block applications. The 4.020 inch bore specification ensures tight tolerances for proper ring sealing and minimal blowby, critical factors in maintaining compression and engine longevity. Ring grooves are precision-machined at 5/64 x 5/64 x 3/16 inch dimensions, engineered to accommodate standard small block Chevy ring packages while preventing ring flutter and maintaining consistent oil control. Weighing just 1.52 pounds, the piston's design balances reciprocating mass to reduce inertial stress on connecting rods and crankshaft.

Mechanics and engine builders working on 262, 283, 305, and 350 cubic inch small block Chevy engines will find this cast piston essential for standard or overbore applications. Installation requires proper honing to 4.020 specifications and correct piston-to-wall clearance (typically 0.0015–0.0025 inch for cast pistons) to ensure optimal performance and service life. Whether performing a complete rebuild, addressing bore wear, or assembling a reliable daily-driver engine, this SBC piston delivers the proven performance and fitment that experienced technicians demand.