Manley 560170CE-8 Chevy LT1 Direct Injected 4.070in Bore -12cc Dish Extreme Duty Forged Pistons

Built from high-strength 2618 alloy aluminum, these pistons are designed to withstand the rigors of high-performance and forced-induction racing applications while delivering reliable long-term service life.

The Extreme Duty designation means these pistons ship with a 9310 alloy wrist pin (2.300" x .170" wall), a significantly stronger option compared to the chrome moly pin found in the Standard Duty series — making them the preferred choice for boosted or nitrous-fed builds. Moly-coated skirts reduce friction and promote ring seal under extreme cylinder pressures.

Key Specifications:

• Bore Diameter: 4.070"
• Stroke: 3.622"
• Rod Length: 6.125"
• Compression Height: 1.304"
• Piston Head Volume: -12cc Dish
• Compression Ratio @ 60cc: 10.5:1
• Piston Weight: 471 grams
• Wrist Pin: .927" floating, 9310 alloy (2.300" x .170" wall)
• Ring Pack: 1.2mm / 1.2mm / 3.0mm (660-46017-8 Ductile Iron Top Ring)
• Skirt Coating: Moly coated
• Alloy: 2618 aluminum forging
• Country of Origin: United States

Manley's proprietary "one fixturing" manufacturing method ensures perfect ring groove-to-skirt squareness, which translates directly to optimum ring seal and maximum horsepower output. "Contour forgings" provide an ideal balance between strength and weight without grain-interrupting internal milling. Compatible add-on ring sets: P/N 46017-8 or 46017ST-8.