OE Standard Piston – Volvo B20 / B30 (up to 1973)

OE-specification standard piston made from cast aluminium for Volvo B20 and B30 engines up to model year 1973. Supplied complete with piston rings and a 22 mm piston pin, ready for installation.

Features a flat-top piston design in line with original factory specifications, making it suitable for engine rebuilds and period-correct applications where proper fit, durability, and consistent sealing are essential. A proven choice for original restorations, street use, and historic motorsport.

Designed for engines retaining the standard bore size and used with early cylinder heads to maintain OE-correct compression characteristics.

Specifications

• Engines: Volvo B20 (4-cyl) and B30 (6-cyl), up to 1973

• Bore diameter: 88.90 mm (standard)

• Piston pin diameter: 22 mm

• Piston type: Flat-top

• Material: Cast aluminium

• Supplied per cylinder: piston, piston rings, and piston pin

• Manufacturer: Mahle / Volvo OE

• OE references: 3731, 03731STD, 0373100, 272002