CP Piston & Ring Set for Toyota 4AG 20V - Bore (81.5mm) - Size (+0.5mm) - CR (12.0) - Set of 4

If you're rebuilding the heart of your Toyota 4AG 20V engine, especially for performance applications, a solid set of pistons is crucial. This CP Pistons set is built for that task, offering a 12.0 compression ratio and a bore size of 81.5mm, with a +0.5mm oversize to help you achieve a perfect fit during your rebuild. These aren't just stock replacements; they're forged pistons designed to handle more stress than cast aluminum.

CP Pistons uses a forged aluminum alloy for these pistons. This process creates a much stronger and more durable piston compared to cast pistons, which is essential when you're pushing an engine harder, whether that's on the track or just for spirited street driving. The 12.0:1 compression ratio is a notable bump over stock, which can help increase power and throttle response when paired with appropriate tuning. This set includes the pistons and rings, ready for installation. Remember that this specific part is not CARB approved and cannot be shipped to California.

When you're diving into an engine rebuild of this caliber, attention to detail is key. Ensure your machine shop is aware of the 81.5mm bore and the +0.5mm oversize when preparing the cylinders. Proper ring gap and piston-to-wall clearance are critical for performance and longevity, so always follow the manufacturer's installation guidelines closely.