CP RB30 Block RB25/26 Head Hybrid Pistons .5mm OS 8.2:1 SC7302

CP offers over 140 shelf part pistons from the Sport Compact shelf line with a wide range of bore sizes and compression ratios for the most popular engines. Each of these pistons was designed through extensive research and development with the cooperation of some of the biggest names in motorsports.

These pistons are already designed for oversized valves and high lift camshafts.

All of our pistons represent the highest quality and are engineered for maximum power. Pistons come with Rings, pins, and locks.


In most cases, these are a direct replacement for your stock pistons.

CP pistons have been regarded as "the worst kept secret in motorsport" - and for good reason.

Features include:

Forged from high strength 2618 Alloy
Super lightweight designs
Fully CNC machined and balanced to within 1 gram
Wrist pins included at no extra cost
Double pin oilers, force fed from oil ring
Pick lock grooves for easy lock removal
Huge range of sizes and applications for most imports

These pistons are specially designed to suit the popular RB30 block, combined with RB25/26 head conversion requiring a 0.5mm oversize piston. 

These are approx 8.2:1 CR with RB26 head.  8.5:1CR with RB25 head.  8.7:1 CR with RB25 Neo head.