Dart Pro 1 20° 451cc Fully CNC Ported Aluminum Heads

Dart Pro 1 20° Fully CNC Ported 440cc Aluminum Heads

$5820.00

Dart Pro 1 fully CNC ported 20° #19775199 aluminum racing heads with 451cc intake port and a 97cc combustion chamber are some of the best 20° heads produced by Dart. Our heads use only Dart valves, Dart Triple .900″ lift House Springs, 10° Locks and Titanium Retainers. We also include the required spacer kit for either #62220010 SD or #62220011 TD height applications.

 

Components

  • Dart Pro 1 20° 451cc Fully CNC Ported Aluminum Heads
  • Dart 50° Intake and 55° Exhaust Valve Seat Angles
  • 451cc Intake Ports with a 2.4 Valve Flow 489 cfm @ 1.0″ Lift
  • 156cc Exhaust Ports with a 1.8 Valve Flow 357 cfm @ 1.0″ Lift
  • Copper Impregnated Powdered Metal Valve Seats
  • Dart Mag-Bronze ½” OD Fully Machined Valve Guides .530″ Seal
  • Utilizes Existing BBC Intake Manifolds with Spacer End Rail Kit
  • Uses a .600″ Raised Exhaust Standard BBC Header Pattern
  • Uses Jesel or T&D Shaft Rocker System
  • Stock Hardware Bolts Directly to the Cylinder Heads
  • Increased Deck Thickness to Support Power Adders
  • Uses 1″ Longer Head Bolts Over the Exhaust
  • Machined to 97cc CNC Ported Combustion Chambers
  • Intake, Exhaust and Combustion Chambers are Fully CNC Ported
  • Dart 2.400″ Stainless Steel Intake Valves
  • Dart 1.800″ Stainless Steel Exhaust Valves
  • All Valve Seats Hand Lapped to Insure the Perfect Seal and Valve Job
  • Dart Triple House Springs for a .900″ Lift Cam
  • Dart House +.100 Titanium 10° Retainers
  • Comp Cams 611-16 10° Machined Super Locks
  • U.S. PC Valve Stem Seals Installed (we never leave these off)
  • Dart Hardened Spring Seats or Washers
  • Hot Washed Blown Dry, Lubed and Final Spring Set to Specifications
  • Professionally Assembled, Packaged and Sealed

Available Upgrades

Flat Milling for 1 cc lost is every .005″ material removed off the deck surface to get 92cc Combustion Chambers would be .025″ Removed
+ $ 100.00
Manley Severe Duty 2.4 Intake and 1.8 Intake and Exhaust Valves, Both Sets
+ $ 395.00
Manley Extreme Duty and Marine Enconel Exhaust Valves
+ $ 395.00
Titanium #21472400 Dart Intake Valves
+ $ 799.00
Titanium #21471800 Dart Exhaust Valves
+ $ 799.00
Pro Series Dart Specific Fit Head Stud Kit with ½” 12 Point Fasteners for Easy Installation and Clearance Issues
+ $ 295.00
T&D any Ratio Pro Series Shaft Rocker System
+ $1690.00
Jesel any Ratio Pro Series Shaft Rocker System
+ $1890.00
Fel Pro MLS Head Gaskets (up to 4.640 bore size and .053″ thickness, other sizes available)
+ $ 195.00
ARP Specific Fit Pro Series Head Stud Kit with Hex Fasteners and Washers
+ $ 325.00
ProFiler Sniper CNC Match Ported Intake Manifold
+ $ 495.00
Dart 4112400 or 41125000 CNC Match Ported Intake Manifolds for 4500 Series Carburetors
+ $ 595.00
68000040 Dart Cast Aluminum Valve Cover Set with Dart Valve Cover Stud Kit
+ $ 384.00
68000045 Dart Fabricated Aluminum valve Cover Set  with Dart valve Cover Stud Kit
+ $ 495.00
Jomar Special CNC Ported 1¼” Spacer, Stud, Gaskets that actually makes up to 5hp and 10lbs of torque
+ $ 120.00

All Completed Heads Come with Specific Build Sheet, all Part numbers, Spring Rates and Installed Height Settings

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