These are the TFS PowerPort 325cc intake runner aluminum heads with 78cc chambers, titanium retainers. And a max lift of. Looking for serious Big-Block horsepower? Trick Flow PowerPort® cylinder heads for Ford 429/460 engines are fully assembled and deliver significant horsepower and torque gains over similar-style cylinder heads. Highlights include an extremely efficient chamber design for more complete combustion and exhaust ports raised. 270 from stock for increased airflow. Trick Flow PowerPort 325 heads are available with two runner configurations: Heads with CNC Street Ported runners are great entry-level CNC heads featuring fully CNC-machined runners and combustion chambers with a standard resolution surface finish for significant performance gains over regular…