The PROFessional Powertrain HP451PC Cylinder Block Components are designed for a 7.4L V8 OHV 16V Chevrolet engine, specifically made for high-performance applications with 525 HP and 550 TQ of power. This engine long block includes a sturdy iron cylinder block, aluminum cylinder head, intake manifold, oil pan, and harmonic balancer. It also features a main bearing cap with 4 bolts and comes with a flexplate and timing cover optional. Perfect for boat engines or other vehicles requiring a powerful 396.0 displacement engine, these components ensure top-notch performance and durability for engines built between 1968-90.