Dart 19574136 - Dart BB-Chevy Pro 1 Aluminum Heads

Dart #301-19574136

BBC Pro 1 Assembled CNC Head

Valves: 2.300" Int/1.880" Exh

Dual Valve Springs: 1.625"
(250 lbs @ 2.00", .790" max lift)

Accessories

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Complete list of Dart BB-Chevy Pro 1 Aluminum Heads

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Dart 19574136 - Dart BB-Chevy Pro 1 Aluminum Heads Details

CNC-Ported BB-Chevy

Intake Ports: 355cc

Combustion Chambers: 121cc

SPECIFICATIONS

Block: Mark IV, Gen V, Gen VI with proper head gasket

Valvetrain: Standard BBC 7/16" stud mount

Intake Port Location: Stock

Intake Port Dimensions: 1.760" x 2.500"

Intake Flow: 415 cfm @ .800" lift/28"

Intake Gasket: #720-121

Exhaust Port Location: Raised .300", Standard bolt pattern

Exhaust Port Dimensions: 2.000" x 1.740"

Exhaust Flow: 303 cfm @ .800" lift/28"

Exhaust Gasket: #375-1412

Manifold: 6.25" tall, Rectangular port, 1.575" x 2.250" opening

Pushrod Length: Avg +.200"/ +.250" (should always measure)

Stock Length: 8.275" Int/9.250" Exh

Pushrod Guide Plate: Must use #249-4806-8

Retainers: Titanium

Stud Girdle: Must use #301-64110001

Valve Length: 5.475" Int (+.250"), 5.435" Exh (Stock)

Valve Angles: 24° Int/15° Exh (Rolled 2°)

Valve Stem Diameter: .3415", 11/32"

Valve Guides: 1/2" OD Mag-Bronze cut for .530" PC seals (.002" press)

Valve Guide Length: 2.250" Int/2.250" Exh

Valve Guide Clearance: .0014" to .0021" (using Dart .3415" valve stem)

Valve Guide Spacing: Exhaust moved .045" away from intake

Valve Seats: Ductile Iron, .006" press (TIR .004")

Valve Seat Dimensions: Intake 2.450" x 2.000" x .375", Exhaust 2.000" x 1.600" x .375"

Valve Seat Angles: Intake 32°, 45°, 60°, 70°; Exhaust 37°, 45°, radius

Dart Pro Stock Technology at Unbeatable Prices
Inspired by Dart's championship-winning Pro Stock designs and available with 310, 325, 345, or 355cc oval or rectangular port intake runners, big block Pro 1 aluminum cylinder heads deliver out-of-the-box airflow that smokes the competition! Specifically engineered for street performance, bracket racing, and Super Eliminator engines yet can be used with off-the-shelf pistons, valvetrain components, and intake manifolds.

Race-Proven Pro 1 Features

Advanced manufacturing techniques provide precision castings

Extra-long intake valves & rolled valve angles

Magnesium bronze valve guides reduce stem wear & extend cylinder head life

Multi-angle intake seats & radiused exhaust seats dramatically increase airflow

Hardened exhaust seats compatible with unleaded gasoline

Exhaust ports raised .300" (Requires 1" longer head bolts next to exh ports. Use #070-135-3605.)

Spark plug holes machined for gasketed 3/4" reach plugs

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