Volvo B20/B30 Oversize Pistons (1974–) – +0.015" (89.29 mm)

Oversize piston set for later-type Volvo B20 and B30 engines (1974–), intended for engine blocks that are bored and honed to +0.015" (89.29 mm). Used during engine rebuilds to restore correct clearance, sealing, and stable operation.

The pistons feature a flat-top design, providing a predictable combustion chamber and making it easier to control compression ratio in standard and mildly modified engines. A proven choice for rebuilds, street use, track days, and historic motorsport where original geometry is preferred.

Supplied as a set including four pistons, piston pins, and piston rings.
(B30 engines require a total of six pistons.)

Specifications

• Engines: Volvo B20 (4-cyl) and B30 (6-cyl), 1974–

• Oversize: +0.015"

• Diameter: 89.29 mm

• Piston type: Flat-top

• Piston pin diameter: 24 mm

• Contents: 4 pistons, piston pins, and piston rings

Note: B30 engines require six pistons in total.