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Dart Big Block-Chevy Iron Eagle Marine Cylinder Head 308cc Intake Ports

Dart 15100112M


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Estimated to ship directly from the manufacturer on 08/31/18
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Dart Big Block-Chevy Iron Eagle Marine Cylinder Head 308cc Intake Ports $1,301.83
Big Block-Chevy Iron Eagle Marine Cylinder Head
  • 308cc Intake Ports
  • 119cc Combustion Chambers
  • 2.25'' Int
  • 1.88'' Inconel Exh Valves
  • 1.550'' Springs, 195lbs @ 1.900''
  • .690'' Max Lift
  • Assembled, Sold Individually

  • Dart 15100112M Details

    Big Block Chevy Iron Eagle Cylinder Heads - 308cc Intake Ports, 119cc Combustion Chambers


    Material: Superior cast iron alloy
    Combustion Chambers: 119cc
    Intake Valve Dia: 2.25''
    Intake Port Dim: Int Port Location: Stock
    Intake Gasket: Mr. Gasket 720-121
    Exhaust Valve Dia: 1.88''
    Exh Port Volume: 129cc
    Exh Port Dim: 1.670'' x 1.800''
    Exh Port Location: Raised .300'' Standard Bolt Pattern
    Exhaust Gasket: Fel-Pro 375-1412
    Exhaust Bolts: 1'' longer than stock (4) ea.
    Flow, Intake: 363cfm @ .800'' lift
    Flow, Exhaust: 266cfm @ .800'' Lift
    Manifold: Rectangular Port Dart (opening - 1.575'' x 2.250'') 6.25'' tall
    Milling: Min 110cc (.005'' = 1cc) Flat Mill only
    Pistons: Most aftermarket pistons
    Push Rod Length: Avg +.200'' / +.250'' Should always measure; Stock Length Int = 8.275'' / Exh = 9.250''
    Retainers: 1.625'' - Titanium / 1.550'' - Moly Steel 10°
    Spark Plug: .750'' reach, gasketed, Champion C59C / C59YC Street RC12YC
    Spring Cups: 1.625'' - .035 cup / 1.550'' - ID locator
    Springs: 1.550'' Double Springs, 195lbs @ 1.900'', .690'' Max Lift Comp Cams 249-954
    Stud Girdle: Must use Dart design 301-64110001
    Valve Angles: Int - 24°, Exh - 15° (Rolled 2°) 4° cant
    Valve Length: Int - 5.475'' (+.250'') Exh - 5.435'' (Stock)
    Valve Stem Dia: 11/32''
    Valve Train: Standard BBC 7/16'' stud mount
    Valve Guides: 1/2'' OD Mag-bronze Cut for .530'' PC seals (.002'' press)
    Valve Guide Length: Int - 2.100'' Exh - 2.250''
    Valve Guide Clearance: .0014'' - .0021'' (with 11/32'' dia valve stem)
    Valve Guide Spacing: Exh moved .045'' away from Int
    Valve Seats: Exh = Tungsten hardened alloy, .006'' press (TIR .004)
    Valve Seat Dim: Exh - 2.000'' x 1.600'' x .375''
    Valve Seat Angles: Int = 32° - 45° - 60° - 70°, Exh = 37° - 45° - radius
    Valve Covers: 301-68000040
    Torque: Head Bolts = 70 ft/lbs; Rocker Studs = 45 ft/lbs; Manifold = 35 ft/lbs
    Block Use: Mark IV, Gen V, Gen VI with proper head gasket
    Weight: 70 lbs


    Manufacturer's Part Number:

    Imagine that you could get the advanced features of Dart's championship-winning aluminum big block heads in a cast-iron version. Now you can at a price that fits every budget!

    Dart's Big Block Iron Eagle Cylinder Heads were designed for street performance, bracket racing, oval track competition, tractor pulling, and high-performance marine applications. There are two rectangular ports: a high-velocity 308cc intake runner that produces incredible torque and a 345cc version that's perfect for big-inch, high-RPM Rat motors. The Iron Eagle's raised exhaust port outperforms its cast-iron competition but still fits most standard headers. Dart's dedicated tooling allows ports to be cast with incredible precision so you get maximum flow without spending big bucks on porting. Valve angles are rotated two degrees, and the efficent heart-shaped combustion chambers originally developed for Dart's championship-winning Race Series aluminum heads have been replicated.

    Iron Eagle big block heads have standard features you won't find in factory castings and aftermarket replacement heads. Premium bronze valve guides, multi-angle intake valve seats, and hardened and radiused exhaust seats are included with every Iron Eagle head. When you want premium performance at an economical price, demand Dart Iron Eagle Heads.

  • Bolt-on Compatability: 2° rolled valve angle and standard spacing
  • Heart-Shaped 119cc Chambers: Improve combustion efficiency
  • Multi-Angle Intake Seats: Compatible with unleaded gasoline
  • Exhaust Ports Raised .300": Improves flow (requires 1" longer head bolts next to exhaust port)
  • Manganese Bronze Intake Valve Guides: Extends cylinder head life
  • Phosphorous Bronze Exhaust Valve Guides: Resist heat produced by low-compression engine

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    Some parts are not legal for use in California or other states with similar laws / regulations