Dart PRO1 15° 280cc Cylinder Head (ASSEMBLED w/ DUAL SPRINGS) Part #110301523

Dart

Price: $1,926.45
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SKU:
11030153
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Recommended for engines with 4.000” bore or larger. Maximum competition, comp/modified drag racing, circle track, and heavy duty applications.

Dart’s new LS based PRO1 LS 15° 280cc Aluminum square port cylinder head for GM LS series small block V8 engines take performance to the next level. Offers higher performance and more versatility than factory designs.

The 15° based high performance cylinder head has better airflow, more efficient combustion chambers and more user friendly features than production LS castings. The Dart PRO1 LS 280cc cylinder head retains stock valve angles, stock valve locations and stock accessory mounting holes to make installation easy. Virtually everything else has been improved.

Heads are sold individually.

 

Material: RMR cast aluminum

Comb Chambers: 68cc

Intake Valve Dia: 2.165”

Intake Port volume: 280cc

Intake Port Dim: 2.600” x 1.260”

Intake Port Location: Stock LS3 location and bolt pattern

Intake Gasket: OE or Fel Pro - LS3

Exh Valve Dia.: 1.600”

Exh Port volume: 102cc

Exhaust Port Dim: 1.750” h x 1.550” w

Exh Port Location: Stock LS3 location and bolt pattern

Exhaust Gasket: OE or Fel Pro 1438

Flow, Intake: 370 cfm @ .800” lift / 28”

Flow, Exhaust: 252 cfm @ .800” lift / 28”

Manifold Accepts OE or aftermarket LS3 manifolds

Manifold Milling: .005”=1cc

Push Rod length: Always measure

Push rod Guide Plate: N/A

Retainers: Titanium

Spark Plug: Autolite AR3935

Spring Locators: 1.300” O.D.

Spring Pockets: 1.350” diameter (can go 1.550”) but no deeper on depth

Springs: 1.290” Beehive 120@1.800” 1.295” Dual 140@1.800” (1.550” option)

Valve Length: 4.880”

Valve Stem Dia: 8mm

Valve Train: OE or aftermarket LS3 valvetrain

Valve Guides: .439” O.D.

Valve Guide length: 2.100”

Valve Guide clearance: .0015” - .002” (with our .3144” dia. valve stem)

Valve Guide Spacing: 2.013”

Valve Seats: Copper Infiltrated

Valve Seat dim: Int: 2.250” x 1.950” x .375” Exh: 1.650” x 1.280” x .375”

Valve Seat angles: Intake: 32°-45°-60°-70°-80° Exhaust: 37°-45°-radius

Stud Girdle: N/A

 

All warranty questions, claims or otherwise should be directed toward the manufacturer, Dart Machinery.

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