Engine Cylinder Head

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.

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.

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.

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.

Additional Attributes:

GTIN: 00085347899197
CNC Machined Combustion Chamber: Yes
CNC Machined Exhaust Port: Yes
CNC Machined Intake Port: Yes
CNC Ported: Yes
Combustion Chamber Volume: 120.0
Cylinder Head Style: Bare
Deck Height: 10.2
Exhaust Port Location: Raised
Exhaust Port Shape: Oval
Exhaust Runner Volume: 90
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
Intake Valve Job Diameter: 2.450″
Material: Aluminum 356-T6
Retainer Lock Style: Not Included
RGL: WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.
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
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

Extended Information:

Emissions : Available to Order
Life Cycle Status: Available To Order

Packaging:

Quantity of Each: 1
Package UOM: EA
Dimension: 26 x 11 x 9.5 inches
Weight: 43.4 PG