Dart 11111112L - Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads

Dart #301-11111112L

LT1/LT4 Pro 1 Assembled Cyl Head

Dual Valve Springs: 1.437"
(130 lbs @ 1.80", .620" max lift)

Accessories

Share |

Complete list of Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads

Details
Overview
Accessories

Dart 11111112L - Dart LT1/LT4 Pro 1 Aluminum Cylinder Heads Details

LT1/LT4

Intake Ports: 180cc

Combustion Chambers: 58cc

Valves: 2.02" Int/1.60" Exh

Angle Plug

SPECIFICATIONS

Block: LT-style with reverse cooling passages

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

Intake Port Location: Stock

Intake Port Dimensions: 1.190" x 2.075"

Intake Flow: 257 cfm @ .500" lift/28"

Intake Gasket: #375-1284

Exhaust Port Location: Stock

Exhaust Port Dimensions: 1.410" x 1.350"

Exhaust Flow: 172 cfm @ .500" lift/28"

Exhaust Gasket: #375-1470

Manifold: LT-style

Pushrod Length: Stock (should always measure)

Pushrod Guide Plate: Not used (uses stock-type self-aligning rockers)

Retainers: Steel 10°

Stud Girdle: Any standard girdle

Valve Length: 4.890"

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

Valve Guides: .439" OD Mag-Bronze (.002" press)

Valve Guide Length: 2.100"

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°; Exhaust 37°, 45°, radius

The Ultimate Bolt-On Cylinder Heads for SB-Chevy

These heads feature 3/4" decks (great for nitrous or blower applications) and exceptional flow characteristics (ideal operating range: 2500 to 6500 RPM; higher ranges possible depending on combination of parts). Standard valve spacing and 23º valve angles make them the perfect street cylinder head for 350 to 383 engines. Sold individually.