The 385 hp rating of the engine is complemented by excellent low-rpm torque, with the SP350/385 generating 405 lb.-ft. of torque at 3,600 rpm. It’s all due to the high-flow, lightweight aluminum cylinder heads.
SP350-385 Tech Specs
 Engine Type: Chevy Small-Block V-8
 Displacement (cu. in.): 350
 Bore x Stroke (in.): 4.000 x 3.480
 Block: Cast iron with 4-bolt main caps
 Crankshaft: Forge steel, shot peened
 Connecting Rods: Powdered metal
 Pistons: Hypereutectic aluminum
 Camshaft Type: Hydraulic roller
 Camshaft Lift (in.): 0.474” intake / 0.510” exhaust
 Camshaft Duration (@.050 in.): 208° intake / 221° exhaust
 Cylinder Heads: Fast Burn aluminum; 62-cc chambers
 Valve Size (in): 2.000 intake / 1.550 exhaust
 Compression Ratio: 9.6:1 nominal
 Required Fuel: Premium pump
 Ignition Timing: 36° total at 4000 rpm
 Maximum Recommended rpm: 5800
 Balanced: External

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