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Chevrolet Performance LS-Series LS7 Racing Cylinder Head, CNC-Ported and Assembled

Chevrolet Performance 12578449

809-12578449

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Chevrolet Performance LS-Series LS7 Racing Cylinder Head, CNC-Ported and Assembled $1,539.15
LS-Series LS7 Racing Cylinder Head
  • CNC-Ported and Assembled
  • Sold Individually, 1/pkg

  • Chevrolet Performance 12578449 Details

    LS7 Aluminum Cylinder Head

    Assembled Head Components:
  • Intake Valves - P/N 12591644
  • Exhaust Valves - P/N 12578455
  • Valve Springs - P/N 12621428
  • Valve Locks - P/N 10166345
  • Valve Spring Retainers - P/N 12596508
  • Intake Valve Stem Seals - P/N 12482063
  • Exhaust Valve Stem Seals - P/N 12482062
  • Intake Valve Lash Caps - P/N 12596509

  • Specifications:

    Manufacturer's Part Number:
    12578449

    The Chevrolet Performance LS7 CNC Ported Aluminum Cylinder Head design benefits from General Motors' extensive research and development program, ensuring maximum airflow without compromises. In fact, many professional builders use this head as straight bolt-ons, with no further machining. These assembled heads use premium machining and materials, including CNC finishing and porting, along with lightweight, hollow-stem intake valves and sodium-filled exhaust valves to provide your engine with the power increase you have been searching for!

    Features:
  • Manufactured from 356-T6 aluminum
  • 2.20" Titanium Intake Valves
  • 1.61" Sodium Filled Exhaust Valves
  • 12 degree valve angle
  • 270cc CNC'd intake ports
  • 85cc CNC'd exhaust ports
  • 70cc CNC'd combustion chambers
  • Design for big bore LS7/C5R/LSX blocks (min 4.100" bore)
  • All fasteners are metric
  • C5R/LS7 rectangle port design-requires rectangle port intake manifold - 809-25534394
  • Capable of over 600 horsepower!

    LS7 CNC Ported Head Flow Chart
    Valve Lift Intake Flow Exhaust Flow
    .1007160
    .200145120
    .300222159
    .400271192
    .500315207
    .550332214
    .600348219
    .700352221

  • will these heads have the same problem as the stock heads with the valves dropping? or are these heads one way to go to fix the valve problem?

    Asked by: Z066
    No, these are designed for performance use.
    Answered by: Rusty B
    Date published: 2017-12-15
    • y_2018, m_7, d_20, h_24CST
    • bvseo_bulk, prod_bvqa, vn_bulk_2.0.8
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_1
    • loc_en_US, sid_10001_10001_950839, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs
    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations