Dart’s highly popular PRO 1 cylinder heads now benefit from the proprietary Speed Flow™ technology which revolutionized the Iron Eagle line a year ago with the platinum series. Wet flow testing and advanced manufacturing techniques have produced redesigned ports and chambers, resulting in greater breathing characteristics and more controllable combustion.

• Premium alloy: Dart aluminum heads are cast from virgin 355-T6 aerospace alloy for superior strength and integrity
• Bolt on compatability: Standard valve angle and spacing are retained. Accomodates all stock accessories
• Combustion chambers available with 64cc or 72cc volume to tailor compression ratio to individual requirements
• Heart-shaped chambers improve combustion efficiency and fit most standard pistons
• Multi-angle intake seats and radiused exhaust seats dramatically increase airflow
• Hardened exhaust seats are compatible with unleaded gasoline
• Manganese bronze valve guides for extended cylinder head life
• Raised exhaust port roof improves flow while retaining standard port location and bolt pattern
• Choice of angled or straight spark plugs to clear manifolds and headers
• Spark plug holes are machined for gasketed 3/4“ reach plugs
• As-cast heads are bowl-blended on 5-axis CNC machining centers
• Dual exhaust bolt pattern is provided for easy header fitment

Assemblies Include: Stainless steel valves, valve springs, retainers, locks, guide plates, studs and seals.