I posted the following below on the Spider thread, Reducing Weight:
As you can see below, Quads and S4s weigh the most.
From page 12 of the Reducing Weight thread:
I was curious about Spider weights through the years, so I pulled out some old Road & Track magazines and found this information. We of course don't know if the fuel tanks were full or what, although I do believe R & T only filled the tanks 1/2 way.
1959 Alfa Giulietta Spider: 2,050
1965 Alfa Giulia Spider Veloce: 2,150 Lbs.
1966 Alfa 1600 Spider: 2,195 Lbs.
1977 Alfa Spider: 2,430 Lbs.
1978 Alfa Spider Niki Lauda: 2,550 Lbs. (from Motor Trend magazine).
1982 Alfa Spider Veloce: 2,495 Lbs.
1983 Spider Veloce: 2,460 Lbs. (my stock personal car; 1/2 tank of gasoline).
1989 Alfa Spider Quadrifolgio: 2,560 Lbs.
1990 Spider Veloce (Alfa brochure spec.): 2,558 Lbs.
Some other Alfa Romeo weights:
1965 Alfa Sprint GT: 2,200 Lbs.
1966 Alfa Giulia Sprint Speciale: 2,273 Lbs.
1967 Alfa GTV: 2,230 Lbs.
1971 Alfa 1750 GTV Trans Am Race Car, driven by Horst Kwech: 2,245 Lbs.