The early version had a lower compression ratio than the Viva saloon (7.3:1 rather than the usual 8.5:1), producing gross, or net, both at 5200 rpm [REF].
The HA soldiered on in production for twenty years, until 1983, where it was supplanted by the short lived Vauxhall Chevette based Bedford Chevanne which was in turn replaced by the Bedford Astravan / Bedford Astramax.