A little information:
The Pininfarina designed Ferrari 308 debut in 1975 and was immediately a success. The vehicles performance, handling, and styling were phenomenal.
For the initial 18 months of the 308 GTB's production, fiberglass was predominately used for the bodies, but later switched to all-metal. The fiberglass bodies were around 125 kg lighter.
The 308 was capable of producing 255 bhp from its 3 liter, V8, carburetor engine. In 1980, a Bosch K-Jetronic fuel injection system was installed due to new emission regulations. This caused the horsepower to drop to around 215 hp, thus making the 308 GTBi the slowest of the 308 series.
In 1981, Ferrari introduced 4 valve heads for the 3 liter V8's. This 308's now became known as 308 GTB/GTS Quattrovalvole. The engine now produced 240 BHP, and with the extra weight that was imposed due to using all-metal rather than fiberglass, the performance and handling was back to where it was when it began production.
In 1985, Ferrari introduced the 328 GTB/GTS. A vehicle that came equipped with a 3185 cc engine that produced 270 BHP.
For more detailed info:
http://home.comcast.net/~jonathan.bird/tut...uyers_guide.htm