A notable aspect of the early 308 GTB was that, although still built by Carrozzeria Scaglietti, its bodywork was entirely made of glass-reinforced plastic (or GRP), allowing a very light weight of 1,050 kg (2,315 lb).
Un aspecto notable dos primeiros 308 GTB foi que, aínda que seguían a construírse por Carrozzeria Scaglietti, a súa carrozaría era enteiramente de plástico reforzado con vidro (ou GRP), o que permitía un peso moi lixeiro de 1 050 kg.