CP Piston & Ring Set for Toyota 4AG 16V - Bore (81.5mm) - Size (+0.5mm) - CR (12.0) - Set of 4

This is a set of four forged pistons and matching rings from CP Pistons, specifically made for the Toyota 4AG 16V engine. You'll receive four complete piston and ring assemblies, ready to be installed in your engine build. These pistons are designed for an 81.5mm bore and are a +0.5mm oversize, meaning they are intended for an engine that has already been bored out to accommodate this size. The compression ratio is set at 12.0:1, which is a notable increase over stock, making this a good choice for performance-oriented builds where increased power is the goal.

CP Pistons are well-known for their robust construction, and these are no exception. They are forged from high-strength aluminum alloy, which offers a strong yet lightweight solution for high-performance engines. This material choice helps to withstand the increased pressures and temperatures found in modified 4AG engines. The 12.0:1 compression ratio is achieved through the piston's crown design, which works in conjunction with your cylinder head to achieve this specific ratio. It's important to ensure your engine's tuning, fuel system, and camshafts are all compatible with this higher compression to maximize performance and reliability.

When installing these pistons, remember they are an oversize part, so your engine block will need to be machined to the specified 81.5mm bore. Proper piston-to-wall clearance, ring gap, and assembly lubrication are critical for a long-lasting engine. This set is designed for performance applications and is not CARB approved, so it cannot be shipped to California.