CP Piston & Ring for Honda B-Series - Bore (84.0mm) - Size (STD) - Compression Ratio (12.7)

This is a set of forged pistons and rings from CP Pistons, specifically made for Honda B-Series engines. If you're rebuilding the heart of your B-Series Honda and looking for a solid upgrade, these pistons are built to handle more power and stress than stock. They feature a standard bore size of 84.0mm and a compression ratio of 12.7:1, which is a notable bump up from factory specs, meaning you'll see improved performance when paired with the right tuning and supporting modifications.

CP Pistons are well-known for their robust construction, and this set is no different. Forged from high-strength aluminum, these pistons are designed to be durable and resist detonation, which is crucial when you're pushing an engine harder. The 12.7:1 compression ratio is a popular choice for naturally aspirated builds aiming for a good balance of power and drivability, but remember that this higher compression will require premium fuel and careful tuning to avoid issues like knocking. The standard bore size means they're intended for engines that haven't been bored out yet, making them a direct replacement for a stock bore rebuild.

When installing these pistons, it's important to follow the manufacturer's guidelines for ring gap and piston-to-wall clearance to ensure proper break-in and long-term reliability. Because these are a performance part with a higher compression ratio, you'll want to ensure your engine management system is properly tuned to take advantage of them and prevent pre-ignition. This set is not CARB approved and cannot be shipped to California.