Dart 15200136 - Dart BB-Chevy Iron Eagle Cylinder Heads
Dart #301-15200136BB-Chevy Iron Eagle Cylinder Head |
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Dart 15200136 - Dart BB-Chevy Iron Eagle Cylinder Heads Details
BB-Chevy Iron Eagle Cylinder Heads - 345cc Intake Ports, 119cc Combustion Chambers
Specification Material: Superior cast iron alloy
Combustion Chambers: 119cc
Intake Valve Dia: 2.30''
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: 390cfm @ .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: 1.625'' Double Springs, 250lbs @ 2.000'', .790'' Max Lift Vasco-Jet H-11
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: 301-68000020
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
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 - Dart's Iron Eagle big-block head delivers the performance you expect from Dart at a price that fits every budget! Dart designed the Iron Eagle heads for street performance, bracket racing, oval track competition, tractor pulling, and high-performance marine applications. They developed 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. Our dedicated tooling allows Dart to cast the ports with incredible precision so you get maximum flow without spending big bucks on porting. They rotated the valve angles two degrees and duplicated the efficent heart-shaped combustion chambers originally developed for their championship-winning Race Series aluminum heads. 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!
