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  • XS336 - BBC

    Our high flowing “As-Cast” cylinder heads are made out of high quality AC4B aluminum alloy and feature a street performance 3-angle valve job, bronze valve…

  • XS356 - BBC

    Gain an advantage over the competition with our XS356 high performance BBC cylinder heads! These high flow AC4B castings include 100% CNC ported intake/exhaust runners…