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Chevrolet Performance Splayed-Valve Aluminum Cylinder Head, Roughed Machine

Chevrolet Performance 12480146

809-12480146

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Estimated to ship on 10/02/18
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Chevrolet Performance Splayed-Valve Aluminum Cylinder Head, Roughed Machine $1,417.11
Splayed-Valve Aluminum Cylinder Head
  • Rough Machined: Main surfaces & exhaust bolt pattern

  • Chevrolet Performance 12480146 Details

    Standard 4.400" Bore Spacing

    Rough Machined Detail:
  • Machined: Main surfaces and exhaust bolt pattern
  • Not Machined: Head bolt & dowel holes, intake bolt holes, spark plug holes & pushrod holes, valve guides, valve seats, valve spring seats and rocker stands
  • Valve locations and angles may be relocated

  • Specifications:

    Manufacturer's Part Number:
    12480146

    These small block Chevy splayed-valve aluminum cylinder heads are a radical departure from standard in-line valve heads. Their splayed-valve arrangement angles both the intake and exhaust valves inward toward the center of the combustion chamber, allowing maximum valve sizing to dramatically improve airflow without increasing bore diameter. Castings have a 0.240" minimum port wall thickness so, for even greater flow, extensive modifications can be made. Sold individually, these aggressive all-out competition cylinder heads are designed to get the most power from your small block Chevy with no regard for "streetability." NHRA Competition Eliminator participants routinely produce over 1000 horsepower (naturally aspirated) with these race cylinder heads.

    Features
  • 355-T7 aluminum
  • No valve seats or guides
  • "As-Cast" Intake Ports: 240cc
  • "As-Cast" Exhaust Ports: 78cc
  • Extra-thick deck for angle or heavy flat milling
  • Valve spring pads accommodate 1.625'' springs
  • Modified Valve Angles: 16° x 4° Intake, 11° x 4° Exhaust
  • 4.400'' Bore Spacing: 45cc "As-Cast" Combustion Chambers
  • 4.500'' Bore Spacing: 40cc "As-Cast" or Unfinished Combustion Chambers
  • Spark plug location revised for angled 14mm, 5/8" hex, 3/4" reach, gasket seat plugs
  • Designed for longer-than-stock 2.200''/1.650'' valves and aftermarket shaft-mount rocker systems

    Requirements
  • Valve Cover Gaskets #809-10185043
  • Intake Manifold Gaskets #809-10185042
  • Custom-fabricated valve covers and intake manifold

  • Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations

    Motor Vehicles

    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.

    Tools:

    WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

    Electrical Cords

    WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.