This is a new set 82.5 mm Porsche 356/912 je high compression pistons with biral cylinders. It fits Porsche 356; c, sc, 1963-65 & Porsche 912; 1965 and up with the 3 piece case. The cylinders are biral with je forged pistons with 30 angle. Je forgings are made from 2618 aluminum, they have a 0 offset with extra material under the top for the valve pocket, biral liners are a cast iron sleeve with aluminum fins, making them lighter and dissipate heat better. This is a high compression kit 11.5:1 more commonly used in race-cars . This kit requires no machine work, when installing in factory Porsche case & heads

Engine size: 1600 cc
Stroke: 74 mm
Cylinders: biral.
Pistons: je 2618 forged
Dome height: .295
Compression: 11.5:1
Piston angle: 30
Kit includes: 4 cylinders, 4 pistons, a set piston rings, and 4 wrist pins and clips.