CP Piston & Ring Set for Honda B-Series - Bore (84.5mm) - Size (+0.5mm) - Compression Ratio (9.0)

If you're rebuilding the heart of your 1988-2000 Honda Civic or 1994-1997 Acura Integra, especially for a performance build, a strong set of pistons is crucial. This CP Pistons SC7021-4 set is designed for B-Series engines, offering a bore size of 84.5mm and a compression ratio of 9.0:1. These pistons are forged, meaning they start as a solid block of aluminum that's heated and hammered into shape under immense pressure. This process creates a much stronger and more durable piston than cast ones, making them ideal for engines that will see higher performance demands, like boosted applications or track use.

The 84.5mm bore size is a +0.5mm overbore from the standard size, which is common when rebuilding an engine to refresh cylinder walls or to slightly increase displacement. The 9.0:1 compression ratio is a well-balanced figure, suitable for a wide range of modifications. It offers a good increase in power over stock while still being manageable with pump gasoline in many naturally aspirated or moderately boosted setups. CP Pistons are known for their tight tolerances and consistent manufacturing, ensuring each piston in the set is virtually identical, which is vital for smooth engine operation and longevity.

This set includes the pistons and the necessary rings to complete the installation. When installing these, remember to follow the manufacturer's recommended clearances and lubrication procedures carefully. Because these are forged pistons and are an overbore size, it's important to ensure your cylinder walls are properly honed to match the specific piston skirt clearance recommended by CP Pistons for optimal performance and engine life. Please note that this part is not CARB approved and cannot be shipped to California.