The rarest of all the fiberglass 308 road cars are those with the dry sump engine of which only an estimated 100 were built in left and right hand drive. Countries that had more stringent emission control standards at the time, such as the USA and Australia, received wet sump cars only. The reason for this is not known but one theory is the physical space taken up by the dry sump oil tank and hoses was required for the additional emission control equipment.
It is not clear why Ferrari went to the expense of using the dry sump engine for the 308 GTB's, but the most likely reason is they were planning to build a racing version using the lighter fibreglass body. Whilst the dry sump motor has minimal (if any) increase in power over the equivalent spec wet sump, it does have a significant advantage on a race track where oil surging during tight cornering can cause oil starvation in a wet sump engine. The dry sump 308's are also FIA group 4 homologated, where as the wet sump cars are not.
Ultimately it was left to Michelotto to develop a handful of ex-factory fiberglass race and rally cars which are highly prized and sought after today. Mäkelä Auto-Tuning (MAT) in Finland are recognised as one the specialist who can build high quality replica 308 race cars today (see www.mat.fi)