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Cylinder Heads

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  1. Be the first to review this product

    As low as: $649.00

    Add Torque and Power to any production Twin Cam® or Evolution® head with our WorkHorse blueprinting service. After cleaning and Step-Lock guide installation and fitment, proprietary seat and valve machining improves flow and ensures a positive seal by truing now heat-seasoned seats and removing typical production chatter that leads to leaks between the seat and valve. This process improves even new, low mileage heads on engines that are being upgraded with cams or big bore kits. Valves are upgraded to Baisley 1.840” intakes and 1.615” exhausts with Viton seals, while new valve springs are set up for cam selection provided. Head gasket surfaces are skimmed to ensure absolute flatness. This Stage I head delivers a true, high quality “budget upgrade” for any engine. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  2. As low as: $799.95

    Our Stage II CNC heads employ special high velocity ports developed specifically for riders in search of early torque with broad power. With ports designed for high-velocity airflow, matching these heads with the proper camshaft and exhaust produces amazing power. Perfect for riders of heavier machines who want great acceleration just by turning the throttle - no rowing of the gearbox and high RPM needed! Click Here to complete your Job Order Sheet.
  3. As low as: $799.95

    Our Stage III ThunderSport heads are the perfect choice for 3.875 - 3.937” bore Twin Cam® engines with all the highs - high compression, high flow throttle body, high flow exhaust and high output at all RPM’s! Our original design has been fully refined to fulfill the airflow needs of the highly modified Twin Cam® engine with displacement ranging from 95 to 107 cubic inches. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  4. Be the first to review this product

    As low as: $1,359.00

    Our High Output 2.0”Twin Cam© heads are designed for larger displacement, 4 inch+ bore engines. Both ports feature more extensive CNC porting and the intake valve seat is changed and valve size is increased to 2.0 inch. The combustion chamber is enlarged to 97cc and un-shrouded for increased intake flow. Stainless steel valves, Step-Lock guides, Viton® seals and high lift valve springs are installed after the seatwork is finished on our Serdi equipment. These heads are also machined for and include manual compression releases (on non-ACR equipped heads). Used on our 4.125" bore Muscle 107”, 117”, 120” and 124” engine kits. This is the finest modified Twin Cam© head you’re likely to find anywhere! In compliance with ARB emissions laws, this product is not sold or shipped to California.
  5. Be the first to review this product

    As low as: $874.95

    Zipper’s has developed these Stage III heads specifically for CVO 110 and 120R/ST engines to increase port velocity and the result is a huge power increase for these thirsty engines! This unique design delivers an awesome experience, with broad power for all types of riding. Installed on a 110 with Red Shift 657 cams, these heads put over 129 HP through the rear tire with a conservative 10.3:1 compression! Other high output applications are also available. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  6. Be the first to review this product

    As low as: $1,159.00

    Put a set of our Stage III ThunderSport heads on your Sportster® to really let it breathe! Each port is fully CNC machined for exceptional flow rates; two available combustion chamber sizes are un-shrouded and CNC machined for accuracy in volume. Step-Lock guides are installed and honed to precise size, and seats are radius machined to our proprietary shapes on Serdi equipment for oversized valves of 1.900” and 1.615” diameter (883 heads have all 4 seats replaced to accommodate the larger valves). Viton seals and our Pro-Street springs with Titanium collars are installed to provide proper valve train control. These ThunderSport heads will allow your Sportster® engine to reach its full potential!
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