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Chevrolet Performance 12499255

Big Block Chevy Rectangular Port Aluminum Cylinder Head, 572/620 Engine

Chevrolet Performance 12499255

809-12499255

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$1,110.58
Chevrolet Performance 12499255 Big Block Chevy Rectangular Port Aluminum Cylinder Head, 572/620 Engine $1,110.58
To order this item contact Customer Service at 1-800-345-4545.
Big Block Chevy Rectangular Port Aluminum Head
  • 572/620 Engine
  • 118cc Combustion Chamber
  • 2.25" Intake/1.88" Exhaust Valves
  • 310cc Intake Port
  • 118cc Exhaust Port - Raised 5/8"
  • Hydr Roller to .632
  • Completely Assembled, Sold Individuall

  • Chevrolet Performance 12499255 Details

    Street Cylinder Heads

  • Rectangular Port

    Assembly notes:
  • Use intake gasket 809-12506106
  • Intake Bolt Kit 809-12367959
  • Mark IV Use Head Gasket 809-12363413
  • Gen V & VI Use Head Gasket 809-12363411
  • Use Head Bolt Kit 809-12367779

    Technical Specifications:
  • Intake Valves: 12366987
  • Exhaust Valves: 88963128
  • Retainers: 12366990
  • Valve Locks: 12366992
  • Valve Springs: 88963934
  • Valve Seals: 88963936
  • Valve Spring Shims: 88963937
  • Rocker Arm Studs: 3921912
  • Pushrod Guideplates: 3860038

  • Specifications:

    Manufacturer's Part Number:
    12499255

    Chevrolet Performance Bow Tie Cylinder Heads are an ideal combination of street drivability and drag strip performance. They provide a broad power range with ample low-end torque, excellent throttle response, good mid-range torque and enough top-end power to beat your competitors to the finish line! Bow Tie Street Cylinder Heads have rectangular or oval intake ports. Rectangular intake ports are larger in volume and designed to enhance high-RPM horsepower. These heads are best for vehicles that see frequent drag strip action. Cylinder heads with oval intake ports are smaller in volume and designed for greater low-RPM torque. Oval port heads are best for street applications where lots of bottom-end off-the-line power is desired.

    Chevrolet Performance Bow Tie Race Cylinder Heads are designed for monster-cubic-inch stroked big blocks to maximize their performance potential. They're made of 356-T6 aluminum with huge, raised intake ports; larger valves; smaller combustion chambers; and two additional head bolts for increased clamping force. The runners are purposely left smaller to accommodate custom porting.

    Features
  • 356-T6 aluminum
  • Rectangular or oval ports
  • Will work on Mark IV and Gen V/VI blocks
  • 9/16" thick decks
  • As-cast intake and exhaust ports
  • No heat risers
  • 1.55" valve spring seat diameter
  • Heli-coiled 7/16" screw-in rocker stud holes
  • Designed for use with 3/8" pushrods

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