Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

Porsche shows off 911 RSR for World Endurance Championship

Porsche is celebrating the 50th anniversary of the 911 this year with several events including the Retro Classics show in Stuttgart, Germany, an exhibit at the Porsche Museum and honored marque status at the Pebble Beach Concours d'Elegance. Porsche also went racing with the new 911 RSR in the first event of the World Endurance Championship this weekend, and has posted a clip on its YouTube channel. The 991-based Porsche 911 RSR houses a 4.0-liter flat-six making 460 hp with a new six-speed sequential transmission with paddle shifters.

Concept Car of the Week: Renault Espace F1 (1994)

Co-developped with Matra, the Renault Espace was launched in 1984 and pioneered the now very popular minivan/MPV segment. The second-generation version appeared seven years later by which time the competition all had developed competitors. 1994 marked the tenth anniversary of the Espace as well as Renault's third Formula 1 championship as an engine supplier.

A look at Cadillac future products

General Motors has green-lighted the development of a large flagship sedan for Cadillac, sources say, part of its plan to position its luxury brand's lineup to take on the German luxury stalwarts in every key sedan segment. The flagship sedan is to be built on a new rear-wheel-drive platform and arrive by 2015. The long-rumored rwd flagship would challenge the BMW 7-series and Mercedes-Benz S-class and is a key to GM's ambitions to expand Cadillac in China.