Day: 29

Anyone can slap a supercharger on a stock 505-horse LS7 and pick up an extra 200 horsepower. And thanks to the incredible untapped potential of GM’s factory LS7 cylinder heads, gaining huge chunks of horsepower through natural aspiration is fairly easy, too. All it takes is some head work, long-tube headers, and a big hydraulic roller cam. However,

Your spark plugs are like a cipher. And to read a cipher code, you usually need a cipher key. That’s what this is—a cipher key that is going to help you “read” your spark plugs and understand what they’re telling you about how your engine is running. Is your engine running too rich? Too lean?