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

Concept Car of the Week: Buick Y-Job (1938)

Welcome to the first in a new, regular, series of features in which we highlight an important, forgotten or just plain cool concept car each week. Concept cars have thrilled and inspired for decades, testing the limits in terms of technology and design and shaping the ways cars are designed today. They're the pinnacle of our art and probably the thing that first piqued your interest in car design.

Mercedes-Benz S63 AMG Coupe steps out before New York auto show debut

Following the unveiling of the striking S550 Coupe at the recent Geneva motor show, Mercedes-Benz has now taken the wraps off the even more powerful S-class two-door: The 2015 S63 AMG Coupe. It's set to make a public debut at the upcoming New York auto show. The plush, leather-lined four-seater, which will lock horns with the Bentley Continental GT when North American sales get underway later this year, runs a carryover twin-turbocharged 5.5-liter V8 engine from its predecessor, the CL63 AMG.

Zaha Hadid Z-car concept

Zaha Hadid is an Iraq-born and London-based architect, who became the first female recipient of the Pritzker Architecture Prize in 2004. Her ambitious buildings have earned her much acclaim, and having designed the latest BMW factory, Hadid has now turned her sights on cars with the unveiling of the Z-car concept. Not to be confused with the similarly titled Nissan/Datsun, Hadid?s Z-car is a small plastic-bodied monocoque with a prominent lifting door.