The B30 is an inline-six automotive petrol engine produced by Volvo starting in 1968.

The engine also appeared in military, marine, industrial, agricultural, and powercraft applications.

[3][4] Project B358 did not go into production, but most of the early work done on it was revived when development began on the 164, including the six cylinder engine.

Due to their common heritage, many components are shared between the B20 and B30, including pistons, connecting rods, valves and valve-train parts.

The single camshaft is in the block, and operates the two overhead valves per cylinder through pushrods and rocker arms.