AFR 215cc LSX Mongoose Strip cylinder heads are strong, versatile, and a great match for aggressive applications and large stroker engines where your aim is enhancing street/strip performance. These aluminum heads have 100 percent CNC-ported chambers, intake and exhaust ports, and use A356 aluminum castings. They're equipped with AFR's 3/4 in. thick deck and thicker port and combustion surfaces. This medium sized, high-velocity torque monster flows 312 cfm at 0.600 in. of lift, and can handle up to 408 cu. in. motors operating at or below 6,500 rpm. With a minimum bore diameter of 3.900 in., AFR 215cc LSX Mongoose Strip cylinder heads offer serious velocity and still provide significant airflow to generate over 500 hp at the crank! Requires AFR or GM LSX beadlocks which are sold separately. Engines with up to 408 cubic inches operating up to 6,500 RPM with a minimum 3.900 in. bore size.