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Chevrolet Performance Small Block Chevy Splayed-Valve Aluminum Race Cylinder Heads


Chevrolet Performance
Chevrolet Performance Small Block Chevy Splayed-Valve Aluminum Race Cylinder Heads

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


  • 5 Products
    Standard 4.400" Bore Spacing

    809-12480146
    Splayed-Valve Aluminum Cylinder Head
  • Rough Machined: Main surfaces & exhaust bolt pattern
  • $1,566.99
    Order Today Ships 07/29/14

    809-12480147
    Splayed-Valve Aluminum Cylinder Head
  • Semi-Machined: Main surfaces, exhaust bolt pattern, valve guides, and spark plug holes
  • $1,521.99
    Order Today Ships 07/29/14

    809-24502517
    Splayed-Valve Aluminum Cylinder Head
  • Mostly Machined: Main surfaces; exhaust bolt pattern; intake bolt holes; valve guides, seats, spring seats; rocker stands; spark plug holes
  • $1,492.99
    Order Today Ships 07/29/14
    R0X 4.500" Bore Spacing

    809-88958684
    R0X Splayed-Valve Aluminum Cylinder Head
  • Rough Machined: Main surfaces & exhaust bolt pattern
  • $1,114.99
    Order Today Ships 07/29/14

    809-12480153
    R0X Splayed-Valve Aluminum Cylinder Head
  • Semi-Machined: Main surfaces, exhaust bolt pattern, valve guides, and spark plug holes
  • $1,002.99
    Order Today Ships 07/29/14

    5 Products