Dart 11971143P - Dart SB-Chevy Pro 1 Aluminum Heads

Dart #301-11971143P

SBC Platinum Pro 1 Assembled Cylinder Head

Valves: 2.08" Int/1.60" Exh

Dual Valve Springs: 1.550"
(195 lbs @ 1.90", .690" max lift)

Angle Plug

Accessories
Similar Items

Share |

Complete list of Dart SB-Chevy Pro 1 Aluminum Heads

Details
Overview
Accessories
Similar Items

Dart 11971143P - Dart SB-Chevy Pro 1 Aluminum Heads Details

CNC-Ported SB-Chevy

Intake Ports: 227cc

Combustion Chambers: 66cc

SPECIFICATIONS

Block: Iron or aluminum small block Chevy

Valvetrain: Standard SBC 3/8" stud mount or can be modified to 7/16"

Intake Port Location: Stock

Intake Port Dimensions: 2.200" x 1.310"

Intake Flow: 309 cfm @ .700" lift/28"

Intake Gasket: #375-1206

Exhaust Port Location: Stock

Exhaust Port Dimensions: 1.410" x 1.585"

Exhaust Flow: 226 cfm @ .700" lift/28"

Exhaust Gasket: #375-1405

Manifold: 5.5" tall, Aluminum single plane, 1.100" x 2.000" opening

Pushrod Length: Stock through +.100" (should always measure)

Stock Length: 7.800"

Pushrod Guide Plate: Must use #249-4808-8 (flat)

Retainers: Titanium

Stud Girdle: Any standard girdle

Valve Length: 5.035" (+.100")

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

Valve Guides: Intake 1/2" OD Mag-Bronze, Exhaust Mag-Bronze (.002" press)

Valve Guide Length: 1.950"

Valve Guide Clearance: .0014" to .002" (using Dart .3415" valve stem)

Valve Guide Spacing: Moved .030" from stock

Valve Seats: Hardened Ductile Iron, .006" press

Valve Seat Dimensions: Intake 2.160" x 1.810" x .350", Exhaust 1.650" x 1.350" x .350"

Valve Seat Angles: Intake 32°, 45°, 60°, 70°, 80°; Exhaust 37°, 45°, radius

The Best Value in High-Performance
Aluminum Heads for Small Block Chevy
Standard Pro 1 Cylinder Heads deliver outstanding airflow using advanced tooling & state-of-the-art casting techniques while the CNC-ported version provides even more "flow for your dough."

Engineered for easy installation as bolt-on replacements for most conventional 23° heads, Pro 1 heads accept standard small block pistons, headers, and valvetrain components. Dart improved the original design with thicker decks and high-capacity water jackets that increase reliability in high-performance applications. Hardened exhaust seats and durable bronze valve guides greatly extend cylinder head life. Sold individually.

Click the image for more about standard Pro 1 heads.