Best Quality Replacement Engine For Your Chevrolet Approximate Horsepower: 425 3-Year Best In The Business Unlimited Mileage Manufacturer's Warranty For those that want the most from their 383 engine, this aluminum headed engine builds off of our All-Iron 383, producing more torque and more horsepower, while being lighter in weight. This 383 uses flat top pistons, a Scat performance crankshaft, and a custom ground performance camshaft with fully adjustable billet double roller timing. Aluminum PBM cylinder heads with lightweight 2.02/1.6 stainless steel valves and anodized billet roller rockers. Aluminum Head Stroker 383 Includes: Brand New Factory GM Cast Iron 4-bolt Main Block PBM Performance Aluminum Cylinder Heads Lightweight Stainless Steel 2.02 Intake Valves Lightweight Stainless Steel 1.60 Exhaust Valves Anodized Billet Roller Rockers Performance 4340 Forged Crankshaft Forged Flat-Top Pistons Scat Performance Forged Connecting Rods Performance Custom-Ground Roller Camshaft & Lifters Dual Plane Aluminum Intake Manifold Screw-In Studs and Guide Plates Hastings Performance Moly Rings Polished Aluminum Oil Pan Harmonic Balancer Included Chrome Valve Covers Billet Fully Adjustable Double-roller Timing Components With Torrington Bearing H-Series Hardened Rod and Main Bearings Federal-Mogul Gaskets Melling Oil Pump and Screen Durabond Cam Bearings ARP Fasteners