Crate Engine, GM, 350/330HP HO GM # 19420878

Chevrolet Performance 350 HO Long-Block Crate Engine Genuine GM®

350 HO long block uses a four-bolt block, Vortec iron heads and hydraulic flat-tappet camshaft.

Genuine GM® Chevrolet Performance 350 HO long block uses a 350ci four-bolt cast-iron block, forged crankshaft, cast-aluminum pistons, Vortec-style iron heads and a hydraulic flat-tappet cam. Compression is 9.6:1. Induction, ignition and exhaust are selected separately, and the engine requires a Vortec-pattern intake manifold.

Additional Technical Specifications • Horsepower: 330 @ 5000 rpm • Torque (ft./lbs.): 380 @ 3800 rpm • Maximum rpm: 5500 • Compression ratio: 9:1 • Cast-iron block with 4-bolt main caps • Nodular iron crankshaft • Connecting rod: Powdered metal steel • Lift (in): .435 intake/.460 exhaust • Duration (@.050 in): 212° intake/222° exhaust • Cylinder heads: Vortec iron; 64cc chambers • Valve size (in) • intake: 1.94 • exhaust: 1.50 • Stamped steel rocker arms • Rocker arm ratio: 1.5:1 • Ignition timing: 10° BTDC @ 700 rpm • IMPORTANT: Requires the use of an 1986 or newer counter-weighted flywheel.