CP Piston & Ring Set for Nissan RB30/RB25DET-Bore (86.5mm)-Size (+0.5mm)-CR (8.5) - Single

This is a single forged piston and ring set from CP Pistons, specifically made for Nissan RB30 and RB25DET engines. It features a bore size of 86.5mm with a +0.5mm overbore and a compression ratio of 8.5:1. These pistons are a solid option if you're rebuilding or upgrading the engine in your Nissan RB-powered vehicle.

CP Pistons are well-known for their robust construction, and these forged units are built to handle increased stress compared to cast pistons. The 8.5:1 compression ratio is a good balance for many performance applications, offering a noticeable bump in power without being overly sensitive to fuel quality. The +0.5mm overbore means these are intended for engines that have already been machined to this size, typically during a rebuild to clean up cylinder walls or increase displacement slightly.

When installing these pistons, ensure your engine block has been properly bored and honed to the correct size. It's also recommended to use new rings and have them gapped appropriately for your specific engine build. This set includes one piston and the necessary rings to match.