ALUM20072AP2.02/1.601.250

Redesigned Dart Pro 1 chamber with improved fuel distribution. Spark plugs located high and close to chamber center. Five-angle intake seats shear liquid fuel and air. Redesigned intake face, exhaust face, and exhaust ports. Profiled valve guide bosses, cleaner and more consistent casting walls for greater flow, heat, and combustion control. Multiple intake sizes available for mild street to full competition engines. Premium alloy: Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity. Bolt-on compatibility: Standard valve angle and spacing retained for off-the-shelf pistons and valvetrain components. 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 compatible with unleaded gasoline. Manganese bronze intake valve guides and phosphorous bronze exhaust valve guides extend cylinder head life. Choice of angled or straight spark plugs to clear manifolds and headers. Spark plug holes machined for gasketed 3/4" reach plugs. Dual exhaust bolt pattern for easy header fitment. Sold individually.