Best Quality Replacement Engine For Your Chevrolet Approximate Horsepower: 400 3-Year Best In The Business Unlimited Mileage Manufacturer's Warranty A great improvement to the classic 350 small block. The All-Iron 383 uses a brand-new factory GM 4-bolt main block, and a Scat performance 3.750 stroke crankshaft, flat top pistons, and a performance custom ground camshaft to enhance the extreme low-end torque produced by this engine. The camshaft is timed with a fully adjustable, billet double roller timing setup. On the top end, there are a pair of performance World Products iron cylinder heads with stainless steel valves (2.02/1.6) and anodized billet aluminum roller rockers and a matched aluminum dual-plane intake manifold. All-Iron Stroker 383 Includes: Brand New Factory GM 4-bolt Main Block World Products S/R Torquer Iron Cylinder Heads Stainless Steel 2.02 Intake Valves Stainless Steel 1.60 Exhaust Valves Anodized Billet Roller Rockers Scat Performance Crankshaft Federal-Mogul Performance Hypereutectic Pistons Scat Performance Forged Connecting Rods Performance Custom-Ground Camshaft 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 Clevite Rod and Main Bearings Federal-Mogul Gaskets Melling Oil Pump and Screen Durabond Cam Bearings ARP Fasteners