Dart 19674030 - Dart BB-Chevy Pro 2 Aluminum 380cc Heads
Dart #301-19674030BB-Chevy Pro 2 380cc Head |
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Dart 19674030 - Dart BB-Chevy Pro 2 Aluminum 380cc Heads Details
Material: 355T6 alum alloy
Comb Chambers: 124cc
Intake Valve Dia: 2.300"
Intake Port Dim: 1.7740"w x 2.490"h
Int Port Location: Stock
Intake Gasket: Dart 65123500
Exh Valve Dia.: 1.880"
Exh Port volume: 164cc
Exhaust Port Dim: 2.112"w x 1.840"h
Exh Port Location: Raised .500" Std bolt pattern
Exhaust Gasket: Fel-Pro 1412
Exhaust Head Bolts: 1" longer than stock (4) ea.
Flow, Intake: @.800 lift/28" 420cfm intake 330cfm exhaust
Head Bolts/studs: Bolts - ARP# 135-3603 Studs - ARP# 235-4103
Manifold: Rect. Port Dart (opening - 1.575"x 2.250") 6.25" tall
Milling: Min. 110cc. (.005" = 1cc) Flat mill only.
Pistons: Aftermarket pistons.
Push Rod length: Avg. +.200" / +.250" Should always measure
Stock length Int. = 8.275" / Exh = 9.250"
Push Rod Guide Plate Dart adjustable
Retainers: 1.625" - Titanium (10°)
Spark Plug: .750" reach, gasketed. Autolite AR3933
Spring Cups: 1.625" - .035 cup
Spring Pockets 1.740" OD for 1.625" cup (.030" deeper max)
Valve Angles: Int - 24°, Exh - 15° (Rolled 2°) 4° cant
Valve Length: Int - 5.475" (+.250) Exh - 5.435" (stock)
Valve Stem Dia: .3415" - 11/32"
Valve Train: Accepts screw in studs and guide plates, Jesel, and T&D shaft system
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 our .3415 dia. valve stem)
Valve Guide Spacing: Exh moved .045" away from Int
Valve Seats: Ductile Iron, .006" press (TIR .004)
Valve Seat dim. Int. - 2.450" x 2.000" x .375" Exh - 2.000" x 1.600" x .375"
Valve Seat angles: Int = 32° - 45° - 60° - 70° Exh = 37° - 45° - radius
Stud Girdle: #64110001
Valve Covers: Part# 68000020
Torque: Head Bolts = 70 ft/lb Dart inner head studs 3/8-7/16 = 50 ft/lb
Rocker Studs = 45 ft/lb
Manifold = 35 ft/lb
Block Use: Mark IV, Gen V, Gen VI with proper head gasket
Weight: 36.5 lbs
Dart's Pro 2 380cc heads are the next evolution of their big block Chevy lineup. As engine displacements continually get bigger, they saw the need for a larger conventional-style cylinder head to extract the maximum performance from these huge motors. The Pro 2 cylinder heads were designed to make competitive engine building easier and less expensive by incorporating the rugged features of their famous Race Series casting into a ready-to-use, professional quality competition cylinder head. Every intake port, every exhaust runner, every valve bowl, and every combustion chamber is 100% digitally CNC-machined for the ultimate in consistency. The Pro 2 head's 380cc intake runners are paired with 144cc exhaust ports. Intake valves are 2.300", and exhaust valves measure 1.880". Brass head bolt tubes are inserted between adjacent intake runners to allow the ports to be widened. The high-velocity raised exhaust ports are modeled on their own Pro Stock heads using airflow concepts that dramatically improve cylinder scavenging and the engine's ability to accelerate quickly. Multi-angle intake valve seats direct the air-fuel mixture into the chamber like an airfoil, reducing turbulence and preventing fuel separation. Fully radiused exhaust seats provide the smoothest possible transition into the ports for hot exhaust gases.
