Dart's new aluminum cylinder head for GM LS-series small-block V8 engines offers higher performance and more versatility than factory designs. The Dart LS1-style high performance cylinder head has better airflow, more efficient combustion, and more user-friendly features than production LS1 castings - and costs less than comparable OEM heads. The Dart LS1-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.

• Premium alloy: Dart aluminum heads are cast from virgin 355-T6 aerospace alloy for superior strength and integrity
• Two intake port sizes: 205cc and 225cc, cover applications from trucks and street machines to racing applications
• Standard multi-angle intake seats, radiused exhaust seats and CNC machined valve bowls enhance airflow
• Manganese bronze valve guides and interlocking hardened valve seats ensure long-term reliability
• Extra-thick walls provide material for porting
• Additional metal above the ports accommodates valvetrain upgrades
• Racing-inspired combustion chamber improves flame propagation and increases airflow
• Intake valve diameters are matched to port volumes, with 2.02-inch valves for 205cc ports and 2.05-inch valves for 225cc intake runners
• Optimized 85cc exhaust ports (15cc larger than stock) and 1.60-inch exhaust valves scavenge the cylinders quickly
• Bolt on compatability: Standard valve angle and spacing are retained. Accomodates all stock accessories

Comp series aluminum cylinder heads feature high-flowing as-cast ports with profiled valve guide bosses and are bowl-blended on 5-axis CNC machining centers.

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