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Whatsup guys, i just want to know about how does shaving parts of an engine change the compression ratio. I've heard that shaving the piston lowers the compression, but shaving the head increases the compression. I mean when the head is shaved, how does lowering the valves and spark plugs closer...

Hi everybody this be my first post and i gotta say i'm glad to be apart of like the best website that is dedicated to educating people on how to improve a cars performance, yeah this place taught me a lot. Now about my ride, ok i have a 2009 Mazda 3 mps or also known as the Mazdaspeed3 in some...