{"product_id":"victor-cnc-dr-17-cylinder-heads-for-big-block-chevys-120cc","title":"Victor CNC DR-17 Cylinder Heads For Big-Block Chevys  120CC","description":"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. \r\n\r\nOffered \"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.\r\n\r\nEach 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.\r\n\r\nManufactured 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.\r\n\u003cb\u003eVehicle Specific\u003c\/b\u003e\r\n\u003cul\u003e\r\n\u003cli\u003eChevrolet:Big-Block Race\u003c\/li\u003e\r\n\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eAttributes:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eBrand Name: \u003c\/b\u003eEdelbrock\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eGTIN: \u003c\/b\u003e00085347899197\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC Machined Combustion Chamber: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC Machined Exhaust Port: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC Machined Intake Port: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCNC Ported: \u003c\/b\u003eYes\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCombustion Chamber Volume: \u003c\/b\u003e120.0\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eCylinder Head Style: \u003c\/b\u003eBare\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eDeck Height: \u003c\/b\u003e10.2\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Port Location: \u003c\/b\u003eRaised\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Port Shape: \u003c\/b\u003eOval\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Runner Volume: \u003c\/b\u003e90\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eExhaust Valve Job Diameter: \u003c\/b\u003e1.850\"\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eGrade Type: \u003c\/b\u003ePerformance\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eGuide Plates Included: \u003c\/b\u003eNo\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eHead Casting Number: \u003c\/b\u003e6143P\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Port Location: \u003c\/b\u003eRaised\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Port Shape: \u003c\/b\u003eRectangle\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Runner Volume: \u003c\/b\u003e425.0\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eIntake Valve Job Diameter: \u003c\/b\u003e2.450\"\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eMaterial: \u003c\/b\u003eAluminum 356-T6\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eRGL: \u003c\/b\u003eWARNING: 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.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eRetainer Lock Style: \u003c\/b\u003eNot Included\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eSpark Plug Style: \u003c\/b\u003eAngle\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eSpecial Notes: \u003c\/b\u003eFeatures a 0.400 in. raised intake port.. Tall deck engines will require manifold spacers. Standard deck engine can use a Tall deck manifold.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eSteam Holes Drilled: \u003c\/b\u003eSold individually\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Angle: \u003c\/b\u003e17\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Cover Mounting Style: \u003c\/b\u003ePerimeter bolt\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Guide Material: \u003c\/b\u003eBronze\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Guide Size O.D: \u003c\/b\u003e0.500\"\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Lock Style: \u003c\/b\u003eNot Included\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eValve Spring Type: \u003c\/b\u003eNot Included\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch3\u003eExtended Information:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eCountry of Origin: \u003c\/b\u003eUS\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eEmissions : \u003c\/b\u003eEPA Eligible\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch3\u003ePacking Information:\u003c\/h3\u003e\r\n\u003cp\u003e\u003c\/p\u003e\u003cul\u003e\r\n\u003cli\u003e\n\u003cb\u003eQuantity of Each: \u003c\/b\u003e1\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003ePackage UOM: \u003c\/b\u003eEA\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eDimension: \u003c\/b\u003e26 x 11 x 9.5 inches\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cb\u003eWeight: \u003c\/b\u003e43.4 POUNDS\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cdiv id=\"sema-product-fitment\" class=\"product__accordion accordion fitment\"\u003e\u003c\/div\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":44336462823469,"sku":"BDVJ-615467","price":6627.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/2780\/2157\/files\/267a5f63b5f5a.jpg?v=1762922573","url":"https:\/\/montgomeryparts.com\/products\/victor-cnc-dr-17-cylinder-heads-for-big-block-chevys-120cc","provider":"Montgomery Parts","version":"1.0","type":"link"}