Product Description

Crate Engines GM SB - Vortec Heads w/ Roller Cam 420hp, 383ci. Includes Edelbrock 600cfm carb and ignition system. Torque = 440ft-lbs. Block: 4 bolt main, 1-piece rear seal block w/Passenger side dipstick only Square and parallel decked Align honed main bearing bore Cylinders honed on computer controlled machine to within .0002 straightness and roundness Cylinders are sonic tested for thickness Rotating Assembly: New SCAT cast crankshaft Flat top hypereutectic pistons Chevy heavy beam rods with 150,000 psi bolts Hastings Moly rings Balanced rotating assembly Melling high volume oil pump Roller camshaft Roller rockers Heavy duty double roller timing set Cylinder Heads: New Cast iron "vortec" heads 1.25 diameter valve springs Hardened retainers and springs 2.02 swirl polished intake valves 1.60 swirl polished exhaust valves Hardened push rods A Ton Of Extras: Performance aluminum intake manifold 9.5 to 1 compression New chrome valve covers Brass freeze plugs Dyno tested - and shipped with results Comes with 30 month / 50,000 mile warranty Critical Specs: Camshaft: .520 intake, .540 exhaust lift / 236 intake, 242 exhaust duration at .050 Horsepower: 420 Torque: 440 Compression Ratio: 9.5 to 1

This part fits most Chevrolet Cars and Trucks.; exceptions may apply. Please read the complete description to see if this part fits your specific vehicle and application.