Wiseco K0071A155 SBC 415 23-Degree Blower/Turbo Dish Forged Piston Set 4.155 Bore

The Wiseco K0071A155 is a forged piston set engineered specifically for forced-induction Small Block Chevy 415 applications running supercharger or turbocharger setups. Featuring a -36cc reverse dome (dish) crown matched to 23-degree cylinder heads, these pistons deliver the reduced compression ratio necessary for reliable, high-output boosted performance.

Key Specifications:

• Bore: 4.155 in.
• Stroke: 3.875 in.
• Compression Height: 1.062 in.
• Rod Length: 6.000 in.
• Dish Volume: -36.0cc
• Wrist Pin: .927 in. diameter x 2.500 in. (Pin P/N: S424, included)
• Skirt Design: Strutted high-strength forged construction
• Average Weight: 427 grams
• Standard Deck Height: 9.025 in. (0 deck at 9.000 in.)

Compression Ratios (varies by combustion chamber volume):

• 58cc chamber: 9.4:1
• 64cc chamber: 8.9:1
• 70cc chamber: 8.5:1
• 74cc chamber: 8.2:1

• Wrist pin set (S424)
• Note: Ringset (J100F8-4155-5) sold separately

Built with Wiseco's renowned strutted high-strength forging process, the K0071A155 pistons are designed to withstand the elevated cylinder pressures of supercharged and turbocharged engines while maintaining the dimensional accuracy and consistent weight balance critical to smooth, high-rpm operation. These are a build-to-stock item, produced to Wiseco's established production specifications.