Mercruiser 4.3l Vortec Flywheel Cover # 865657 on 2040-parts.com

Heifer fuel

Unlike most people, when Michael Doyle drives past a herd of cattle grazing in a field, he doesn't see future tenderloins or T-bones. He sees fuel. The company Doyle co-owns, North Star Biofuels, is about to start production of biodiesel at a new $15 million, 20,000-square-foot plant in Watsonville, Calif., about 60 miles south of San Francisco.

New details on Mercedes' Porsche 911 fighter

Mercedes-Benz's AMG performance-car division is forging ahead with development of its new twin-turbocharged 4.0-liter V8 powered sports car, nine months before it is scheduled to be revealed at the 2014 German Grand Prix. Known to insiders by its code name, “C190” the two-seat coupe has been conceived to follow in the wheel tracks of the four-year-old SLS at the head of the German carmaker's lineup, aiming to challenge the heady performance and everyday driving appeal of the latest Porsche 911 Turbo at a price that insiders suggest will be in the region of $160,000 when North American sales begin in early 2015. Originally, AMG's new front-engined sports car was tipped to revive the iconic SLC name first used by the SL coupe back in 1971.

Possible Ferrari F70 tester spotted

The above photos of what very well might be a development mule for the next primo Ferrari —likely to be called the F70—were recently posted on the Ferrari 4/5 Competizone Facebook page. The future F70 is expected to be a front-runner in the competition between the very best cost-no-object supercars. The F70 will feature a 7.3-liter V12 coupled to a kinetic-energy-recovery system, a combination that will be good for 920 hp.