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Chevrolet Performance 25534446 - Chevrolet Performance Small Block Chevy Large Port Vortec Cylinder Heads

Chevrolet Performance 25534446 - Chevrolet Performance Small Block Chevy Large Port Vortec Cylinder Heads

Chevrolet Performance#809-25534446

Large Port Cast Iron Vortec Cylinder Head
  • Assembled

    Chevrolet Performance 25534446 - Chevrolet Performance Small Block Chevy Large Port Vortec Cylinder Heads Details

    Bow Tie Large Port Vortec Cylinder Heads

  • Small Block Chevy
  • Sold Individually

    Cylinder Head Components
  • Intake Valves 809-12363757
  • Exhaust Valves 809-12363758
  • Valve Springs 809-12551483
  • 3/8" Rocker Studs (Chevrolet Performance #12552126)
  • Valve Spring Retainers (Chevrolet Performance #10212808)
  • Valve Stem Seals 809-10212810
  • Valve Locks 809-24503856

    Notes
  • Use early model Intake Manifold 809-10185063 or, for best results, Vortec Intake Manifold 809-12366573 (Vortec Intake Manifold 3-step torque specs: 2 ft/lbs, 9 ft/lbs, 11 ft/lbs)
  • Use Intake Manifold Gaskets 809-12497760 (Dual bolt pattern)
  • Use Exhaust Gaskets 375-1470 (Trimming may be necessary)

  • Chevrolet Performance 25534446 - Chevrolet Performance Small Block Chevy Large Port Vortec Cylinder Heads

    Small Block Chevy Bow Tie Large Port Cast Iron Vortec Cylinder Heads are Chevrolet Performance's most powerful cast iron cylinder head designed for street or race applications in the 400-450 horsepower range. As upgraded production heads, they have a thicker deck surface, large runners, bigger valves, and combustion chambers with exceptional low-lift flow numbers. These cylinder heads provide Chevy's Fast Burn performance in an affordable cast iron option.

    Features
  • Cast iron
  • No heat risers
  • Intake Ports: 225cc
  • Exhaust Ports: 77cc
  • Deck Thickness: .450''
  • Popular in short track racing
  • Combustion Chambers: 66cc
  • Hardened exhaust valve seats
  • Machined for 2.00''/1.55'' valves
  • Improved airflow (281 cfm at .600'')
  • Drilled & tapped for 7/16''-14 screw-in studs
  • .530'' maximum valve lift without modification
  • Cast Logos: Vortec (intake port roof), GM (intake port floor), Bow Tie (exhaust side)
  • Dual bolt patterns for: perimeter and centerbolt valve covers & early model and Vortec intake manifolds

    JEGS Easy Kits are designed by JEGS professionals so you get all the parts you need.

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