Description

Victor CNC DR-17 Cylinder Heads for Oval-Port Big-Block Chevrolet engines have 120cc combustion chambers allowing a true flat-top piston configuration for large displacement high-horsepower naturally aspirated pump-gas engines. The Victor CNC DR-17 Oval-Port Cylinder Heads for Big-Block Chevrolet engines (PN 615467) have a larger 120cc combustion chamber designed for large displacement high-horsepower naturally aspirated engines running on pump gas. This design allows for a true flat-top piston configuration promoting greater efficiency and power output. &#x0D &#x0D Offered "bare " these heads feature a 425cc port volume 2.450" intake valves 1.850" exhaust valves raised intake and exhaust ports and a relocated spark plug position. The raised intake and exhaust ports are particularly beneficial in maximizing cylinder fill during the valve opening cycle while the revised spark plug location ensures a more complete combustion. Combined with optimized valve placement these improvements result in better airflow more power and higher overall engine efficiency.&#x0D &#x0D Each Victor CNC DR-17 cylinder head is cast at Edelbrock's state-of-the-art foundry using premium aluminum alloy and machined in the Edelbrock Race Center in Mooresville North Carolina. This material undergoes hot isostatic pressing (H.I.P.) to ensure a more stable and dense grain structure which increases durability and performance. The heads feature large CNC oval ports explicitly designed to maintain high airspeed contributing to a high torque curve throughout the engine's operating range.&#x0D &#x0D Manufactured to the industry's tightest tolerances these heads come fully CNC-machined including their ports and combustion chambers. A 17° valve angle is incorporated to improve flow capability while ductile-iron interlocking valve seats and premium manganese-bronze valve guides ensure long-lasting performance. The valve seat concentricity precision allows a perfect seal eliminating leak-down and increasing cylinder pressure during operation. These heads are designed to be used with a shaft rocker system and can bolt directly onto standard deck blocks with a tall-deck manifold but tall deck blocks require intake runner spacers.

• Specifications

  • CNC Machined Combustion Chamber: Yes
  • CNC Machined Exhaust Port: Yes
  • CNC Machined Intake Port: Yes
  • CNC Ported: Yes
  • Combustion Chamber Volume: 120.0 CCM
  • Cylinder Head Style: Bare
  • Deck Height: 10.2 Inch
  • Exhaust Port Location: Raised
  • Exhaust Port Shape: Oval
  • Exhaust Runner Volume: 90 CCM
  • Exhaust Valve Job Diameter: 1.850"
  • Grade Type: Performance
  • Guide Plates Included: No
  • Head Casting Number: 6143P
  • Intake Port Location: Raised
  • Intake Port Shape: Rectangle
  • Intake Runner Volume: 425.0 CCM
  • Intake Valve Job Diameter: 2.450"
  • Material: Aluminum 356-T6
  • Retainer Lock Style: Not Included
  • Spark Plug Style: Angle
  • Special Notes: Features a 0.400 in. raised intake port.. Tall deck engines will require manifold spacers. Standard deck engine can use a Tall deck manifold.
  • Steam Holes Drilled: Sold individually
  • Valve Angle: 17 DD
  • Valve Cover Mounting Style: Perimeter bolt
  • Valve Guide Material: Bronze
  • Valve Guide Size O.D: 0.500"
  • Valve Lock Style: Not Included
  • Valve Spring Type: Not Included