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Take one 625-horsepower, supercharged LT4 engine and combine it with a seven-speed manual or eight-speed automatic transmission. Throw in a track-inspired lightweight frame, wider tires, and body components designed for optimized downforce, and you’ve got the 2015 Corvette Z06. General Motors introduced the new Z06 at the Detroit Auto Show today, calling it the most

Got questions? We’ve got the answers when the Summit Racing tech department tackles your automotive-related conundrums. This week, we help eliminate an engine knock problem. L.P. Roseburg, OR Q: I just put a new 9.7:1 compression 383 small block engine in my 1978 Chevy 4 x 4 pickup. It has less than 100 miles on