Another collection of Porsches is going to be auctioned and it could be a test of the classic car market

Barrett-Jackson

For the second time in as many months, the headline-grabbing make at a major collector car auction will be Porsche. 

A Barrett-Jackson sale in Palm Beach starting April 8 will includes two Carrera GT supercars and several 930 Turbos.

But while the event is an opportunity to see some of the finest Porsche's of the past 40 years, it's also going to be a test of demand for collector cars.

The auction comes after an unprecedented collection of Porsches owned by comedian Jerry Seinfeld crossed the block to mixed results. It means the Barrett-Jackson auction may be another data point in a burgeoning trend: after years of explosive growth, collector car prices may finally be settling.

These are some of the cars going on the auction block.

The Porsche 930 Turbo, like this 1977 model, was a powerful sports car in an era before any driver aids ...

... with 52,000 original miles and a few owner upgrades, it is a very drivable example of a very desirable Porsche.

Add some sunshine with this very rare 1989 930 Turbo Cabrio "Slant Nose"