By Dave Hobbs. Powertrain engineers continue to extract more power from and reduce emissions on conventional internal combustion engines. When both intake and exhaust camshafts get involved, GM’s variable valve timing system meets both goals.
Remember the good old days? Chubby Checker was singing “The Twist” and we had cheap gas and fast cars. I was a young mechanic a decade later, in the ’70s, and I can still re- call hearing my first GM muscle car sporting a performance camshaft loping into my bay. It was the sound of power, and I knew that this engine wasn’t going to the run like the rest! Read more »