The Shocker CNC Series is our top of the line performance cylinder head. It features professionally designed runners and chambers meticulously CNC ported in the U.S.A. Unlike most of our competitors, we don’t offer different quality CNC designs. At PROMAXX, we provide our elite series at prices that make our competition cringe. Going fast doesn’t have to break the bank, so get a pair of Shocker CNC Series Heads today. Now go out and shock the competition!