DART CYLINDER HEADS- PRO1 LS3 - 15º - 280cc - 68cc CHAMBER - ASSEMBLED - SINGLE - 11030153

DART CYLINDER HEADS - LS3 - PRO 1 - 280cc - 68cc CHAMBER - 4 BOLT - BARE - 11030153

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. For use with hydraulic roller camshafts.