GM

12499101

Genuine GM 12499101 Base Performance Engine

Engine Parts

Small Block V-8 HT383 Base - Performance Engine
340 horsepower
435 torque
Automatic transmission
383 cubic inch

This engine is not designed, nor intended to be used in any marine applications. Designed for pre-1976 street vehicles or any off-road vehicle. Engines installed in vehicles registered and normally operated outside of the United States carry no warranty. Specially tuned for torque, the all new HT 383 delivers great power in a small block package for your truck or street rod. These Chevrolet Performance 383 child. 4-bolt main, cast iron engines, have approximately 9.1: 1 compression with 340 horsepower at 4,500 rpm, and 435 ft./lbs. of torque at 4,000 rpm. Included with these engines are forged 4340 steel externally balanced crankshafts, 5.7 in. powdered metal connecting rods, hypereutectic dished top pistons with offset pins. Hydraulic billet steel roller camshafts are installed with .431 in. intake lift, .451 in. exhaust lift and duration at .050 in. for intake is 196 and 206 for exhaust with lobe centerline at 109 degrees. Stamped steel self aligning rocker arms with 1.5:1 ratios are installed on the Vortec cylinder heads. All aluminum dual plane dual flange intakes with external EGR provisions, cast iron long leg, standard "V" belt rotation water pumps with 1979-86 power steering pump boss. Valve measurements are 1.940 in. for intake and 1.50 in. for exhaust. Additional items installed with these crate engines are 8 in. harmonic balancers, 12 3/4 automatic flex plates, 4 quart oil pans with wind age trays, painted valve covers with oil cap, grommets, provisions for PCV and breathers. Composite front timing covers, brass freeze plugs, engine oil dipstick and tube for passenger side location. Spark plugs come installed along with fuel pump block off plates and Engine lift tabs for easy installs. These HT 383 are ideal replacements for any 1978 and older carbureted engines or off road applications.

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