Dart Pro 1 LS3 Aluminum Cylinder Head 11030153 - 280cc Square Port, Assembled .650'' Dual Springs

The Pro 1 Series heads from Dart cover street and racing applications! The as cast ports are known to flow better than many ported designs and come at a much more affordable price tag. These heads offer better airflow, more efficient combustion chambers, higher performance and more versatility than factory designs. 

Features

• Assembled with 1.295" Dual Valve Springs
• Stock Valve Angles
• Factory valve locations
• Factory accessory mounting holes

Dart Pro 1 aluminum heads for GM LS Series small block V8 engines take performance to the next level. They're available bare or assembled, in both cathedral port and square port designs, for applications ranging from street cars and trucks to all-out racing vehicles. Pro1 LS high performance cylinder heads have better airflow, more efficient combustion chambers, and more user-friendly features than production LS castings. Offered in a variety of valve sizes and port volumes with manganese bronze valve guides, they include multi-angle intake seats and radiused exhaust seats to enhance airflow. All Dart Pro1 LS cylinder heads retain stock valve angles, stock valve locations, and stock accessory mounting holes to make installation easy. Virtually everything else has improved! These cylinder heads are not designed as a stock replacement, they can only be used on 6 bolt LSX-based engines with a minimum bore diameter of 4.000 in. Features stock LS3 valve angles, valve locations, and accessory mounting holes.