CP-Carrillo SC7660-4 Forged Piston and Ring Set Toyota 4AG 20V 82.0mm +1.0mm 12.0:1

The CP-Carrillo SC7660-4 is a complete forged piston and ring set engineered for the Toyota 4AG 20-valve engine.

Each piston is CNC-machined from high-strength forged aluminum and balanced to within ±1 gram for smooth, high-revving operation. The dome design includes five valve reliefs to ensure clearance with oversized valves and aggressive camshaft profiles. A built-in accumulator groove reduces ring flutter and improves ring seal, translating directly to increased power output.

Key Specifications:

• Bore: 82.0mm (3.228 in.) — +1.0mm oversize
• Compression Ratio: 12.0:1
• Stroke: 77.00mm
• Rod Length: 122.0mm
• Compression Height: 1.208 in.
• Dome Height: 0.168 in.
• Piston Head Volume: -5.50cc
• Pin Diameter: 0.787 in. (20mm)
• Ring Pack: 1.00mm x 1.20mm x 2.80mm
• Piston Style: Dome with five valve reliefs
• Set Quantity: 4 pistons

• 4 forged aluminum pistons
• Piston rings (matched set)
• Wrist pins
• Wrist pin retainers

Key Features:

• Dual pin oilers deliver double the oil volume to the wrist pin for superior lubrication under high-RPM conditions
• Radiused valve reliefs provide compatibility with oversized valves and high-lift camshafts
• Accumulator groove minimizes ring flutter for a tighter combustion seal
• Pin fitting final hone on the wrist pin bore for precise fit out of the box
• Balanced within ±1 gram per piston for vibration-free operation

CP-Carrillo's Sport Compact shelf piston line delivers race-proven performance at a competitive price point. Note: This part is designed for the 20-valve 4AG engine. Confirm your engine is a 20-valve variant before ordering, as the 16-valve 4AG requires different pistons.