BBC 12 Degree Hitman X CNC Cylinder Heads
 Hitman X CNC 12 Degree
Race Winning Performance out of the box...
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184-X Series Hitman X 12 Degree CNC Ported BBC Heads
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You can now choose the perfect runner and chamber for your bigger applications. The CNC 490cc intake port is available with a 62cc, 72cc, or 74cc chamber. The Hitman is an awesome choice when building an engine to use power adders such as nitrous and superchargers.
Hitman 12 Degree BBC Racing Cylinder Heads
Material: Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot)
Valve Angle: 12 Degree
Intake Port Volume and Shape: Spreadport Location Oval-Shaped, Fully CNC 490cc
Exhaust Valve: 1.850" - 6.800 long (2.200 Install)
Intake Valve: 2.450" - 6.800 long (2.200 Install)
Valve Spring Pocket: Maximum of 1.655 (no deeper)
Combustion Chamber: Heart-Shaped, CNC 62cc, 72cc & 74cc
Milling: .005 per cc flat milling, .007 per cc angle milling
Deck Thickness: 1/2" deck for Nitrous and Blown applications
Spark Plugs: Revised Location to improve flame travel. Uses Gasketed 3/4" Reach Plugs such as NGK R5671-7 Series
Valve Train: - Uses T&D or Jessel Shaft Mounted Rocker Systems
Bore Spacing: - 4.840 (Standard Big Block)
Valve Guides: Manganese Bronze to assist in extending valve life
Valve Seats: Copper Alloy
Intake Port Design: Pro-Stock Modified Oval Port
Valve Covers - Pro-Filer PN 190
Rockers - Shaft rockers (T & D, Jesel)
Engine Size Recommendation:565+ cid / 9000 RPM
Application: High Performance (i.e. Street/Strip/Marine)
Parts and Accessories
Intake Manifolds: Hitman Single Plane or Hitman Tunnel Ram
