Wiseco K478B115 BBC Quick 16 +42cc Semi-Hollow Dome Piston Kit 4.615 in. Bore

The Wiseco K478B115 is a high-performance forged piston kit engineered for Chevrolet Big Block engines running a Quick 16 Series setup with 24° conventional heads. Featuring a +42cc semi-hollow dome and a 1.120-inch compression height, this kit is purpose-built for serious street and drag race applications targeting high compression ratios.

Forged from 2618 high-strength aluminum alloy, these pistons deliver the thermal stability and tensile strength required for naturally aspirated and nitrous-assisted power adder builds. The semi-hollow dome design reduces reciprocating weight while maintaining the volume needed to achieve aggressive compression ratios with standard Big Block deck heights.

Key Features:

• Bore: 4.615 in.
• Compression Height: 1.120 in.
• Dome Volume: +42cc Semi-Hollow
• Material: 2618 high-strength forged aluminum alloy
• Skirt Type: Strutted with ArmorGlide® coating for reduced friction and seizure resistance
• Vertical gas ports for improved ring seal and reduced blow-by
• Anti-detonation and pressure seal grooves for enhanced combustion stability
• Ring grooves: .043 / 1/16 / 3/16 — rings sold separately
• Wrist pin included: S726 — .990 in. diameter x 2.930 in. length, .180-in. toolsteel wall with Double Spirolox® retainers
• Designed for 24° conventional cylinder heads
• Engineered, forged, and machined in the USA

Compression ratio at 0-deck with a .040-in. head gasket varies depending on head chamber volume and stroke combination. Rings are sold separately — consult Wiseco's recommended ring set for this bore size.