Engine Valve Lifter Acdelco Gm Original Equipment Hl120 on 2040-parts.com

Mercedes SL65 AMG (2012) first official pictures

If you're wondering why Mercedes is persisting with a twelve-cylinder SL in this downsizing era, understand this: the new 2012-spec SL65 AMG exists purely because many buyers at this end of the market demand more of everything. So a Mercedes SL65 AMG with a hulking bi-turbo 6.0-litre V12 has been launched for customers in China, the Middle East and other emerging markets, where millionaires are numerous and fuel prices less of an impediment to sizeable sales. Over here, we'll just ogle the price tag well into six figures and stick with the big-selling SL350 or SL500.

Porsche Cayenne S Diesel: The V8 diesel Cayenne arrives

Porsche has revealed the 2013 Cayenne S Diesel with a 4.2 litre V8 diesel offering 378bhp, 626lb/ft of torque and 0-62mph in 5.7 seconds. Back in April we reported that the Porsche Cayenne S Diesel was on its way with a V8 diesel engine to take on the BMW M50d and the upcoming offerings from Land Rover with a 2014 4.4 litre Range Rover Sport seeming a likely possibility. Now Porsche has caught up and revealed the Cayenne S diesel, which gets the 4.2 litre diesel V8 with a healthy 378bhp and a very useful 626lb/ft of torque, enough to scoot the Cayenne S Diesel to 62mph in 5.7 seconds – a bit slower than the M50d, but all that torque should make it feel at least as lively.

Hennessey fills Z28 Camaro void with 562-hp HPE550

The 6.2-liter V8 in the 2010 Chevrolet Camaro SS cranks out 426 hp or 400 hp, depending on the transmission choice. But there are some people out there who want more. With a higher-performance Z28 Camaro from the factory on the back shelf as General Motors battles for survival, aftermarket tuners are ready to fill the void.