The Vega production cars (Facel FV, later and more famously the HK500) appeared in 1954 using Chrysler V8 engines, at first a 4.5-litre (275 cu in) DeSoto Hemi engine; the overall engineering was straightforward, with a tubular chassis, double wishbone suspension at the front and a solid driven axle at the back, as in standard American practice. They were also as heavy as American cars, at about 1,800 kg (3,968 lb). Performance was brisk, with an approx 190 km/h (118 mph) top speed and 0 to 100 km/h (62 mph) in just under ten seconds.
Most cars were 2-door hardtops with no centre pillar, but a few convertibles were built.
The 1956 model was improved with a bigger 5.4-litre (330 cu in) Chrysler engine and updated transmission and other mechanicals. In the same year production began of a four-door model, the Excellence, with rear-hinged doors (suicide doors) at the back and no centre pillar. The pillarless design unfortunately made it less rigid and the handling was thus poorer than that of the two-door cars, and surviving examples are rare.
1959 models had even bigger engines, a 5.8-litre (354 cu in) and later a 6.28-litre (383 cu in) Chrysler V8, and were quite a bit faster despite their extra weight. The final evolution of the V8 models came in 1962 with the Facel II, which was lighter, with sleeker, more modern lines, substantially faster still, and famously elegant.
Source: Wikipedia, 2012