In 1977, General Motors-Holden's introduced the HZ Statesman, which involved a minor cosmetic facelift. However, it had a significant engineering upgrade, along with the rest of the GMH range, involving the adoption of Radial Tuned Suspension, giving the Statesman better handling.
The previous Director of GMH Engineering, George Roberts had insisted that the Statesman have a high standard of ride comfort (at the expense of ultimate roadholding). (Roberts previously had been the Chief Engineer of the GM Cadillac Division). Prior to HZ, the Statesman's Cadillac style of ride was not to everyone's taste.
The Statesman de Ville and Caprice were supplemented in 1979 by an intermediate model – the SL/E, which was launched with a different "egg-crate" grille.