This was achieved by setting the vee angle to 60 degrees.

[3] The engine was expanded to 2.0 L; 121.5 cu in (1,991 cc) for 1951's B21 Aurelia.

The largest of the original Aurelia engines was the 2.5 L; 149.6 cu in (2,451 cc) 2500 introduced in 1953.

The engine's severe undersquare design was addressed for the 1957 Flaminia version.

The final version was the 2.8 L; 169.3 cu in (2,775 cc) engine.