Dart PRO1 LS 15° 225cc / 62cc Assembled Cylinder Head, .625" Max Lift, Cathedral Port

Dart PRO1 LS 15° 225cc / 62cc Assembled Cylinder Head, .625" Max Lift, Cathedral Port

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PRO1 LS 15° 225cc intake runner covers applications from street cars and trucks to racing. As cast ports flow more than many ported designs at a much more affordable price.

Dart’s 15° 225cc Aluminium cathedral port cylinder head for GM LS series small block V8 engines offers higher performance and more versatility than factory designs.

The Dart LS high performance cylinder head has better airflow, more efficient combustion chambers, and more user friendly features than production LS castings.

The Dart LS style 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.


Part# 11021122
Material: RMR Cast Aluminium Alloy
Comb Chambers: 62cc
Intake Valve Dia: 2.05”
Intake Port volume: 225cc
Intake Port Dim: 1.030”w x 3.230” – 225cc
Int Port Location: Stock
Intake Gasket: MS 92438 or GM #89017465
Exh Valve Dia.: 1.600”
Exh Port volume: 85cc
Exhaust Port Dim: 1.650”w x 1.400”
Exh Port Location: Stock location & bolt pattern
Exhaust Gasket: Fel-Pro# 1438
Flow, Intake: 290cfm @ .500” lift / 28”
Flow, Exhaust: 205cfm @ .500” lift / 28”
Head Bolts: ARP 134-3609 / Stock TTY
Head Studs: ARP 234-4316
Manifold: Stock / Stock type / LS6
Milling: (.0055” = 1cc) Flat Mill
Pistons: Stock style
Push Rod length: Stock (7.400”)
Push rod Guide Plate: N/A
Retainers: Titanium ( 7°)
Spark Plug: Autolite 3934 / NGK FR5, BKR6E
Spring Pockets: 1.350” OD
Springs: 1.290” Beehive - PSI
Valve Length: 4.874” Intake / 4.915” Exhaust
Valve Stem Dia: 8mm
Valve Train: Stock
Valve Guides: .439” OD Mag-bronze
Valve Guide length: 2.100”
Valve Guide clearance: .0013” Intk / .0015” Exhst
Valve Guide Spacing: Stock
Valve Seats: Powder metal, .006” press
Valve Seat dim. Int - 2.160” x .350” Exh - 1.650” x .350”
Valve Seat angles: Int = 32° - 45° - 60° - 70° - 90° Exh = 37° - 45° - radius
Stud Girdle:
Torque: OE / 11mm ARP bolts 70 ft.lbs. 8mm 23ft.lbs.