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The main part of the top end combo is the IK (Iron Killer) 180cc aluminum heads and Horsepower 1 (HP 1) dual-plane intake manifold. The heads are the most budget-friendly in the Brodix line, cast from A-356 virgin aluminum alloy with 2.02 intake and 1.60 exhaust valves, normally with 64cc combustion chambers (ours were ordered with 60cc chambers to keep the compression up), phosphorous bronze valve guides, hardened valve seats, milled and drilled ends for accessories, and a straight spark plug angle. The HP 1 manifold has an operating range of idle-6,000 rpm, and the dual plane design will provide a good torque curve. John spent a little extra money to have Brodix match port the manifold to the heads for an unrestricted transition.