GM Performance Parts ZZ383 Engine


GM Performance
GM Performance Parts ZZ383 Engine

Product images may differ from actual product appearance.


Big Block Performance,
Small Block Price Tag

It all starts with a 383 cubic inch block and the legendary Fast Burn cylinder heads, offering an incredible 460 ft/lbs of torque @ 4500 RPM with a smooth linear delivery. The combination of a 4.000" bore and 3.750" stroke steel crank and a stout .509"/.528" lift hydraulic roller camshaft produces 425 HP @ 5400 RPM. GM testing utilized a single plane intake manifold (#809-12496822), Demon 750 cfm mechanical secondary carburetor (the perfect ZZ383 carburetor), and 1-3/4" primary x 33" long headers with 4" collectors. A dual plane manifold (#809-12366573) can be used but will affect overall peak performance by 15-20 horsepower.

  Specifications

  • Horsepower: 425 @ 5400 RPM
  • Torque: 449 ft/lbs @ 4500 RPM
  • Compression Ratio: 9.7:1
  • Block: Cast Iron 4-Bolt Main with 1-piece rear main seal
  • Crankshaft: Forged 4340 Steel (externally balanced)
  • Connecting Rods: Powdered Metal (special 383 version)
  • Pistons: Hypereutectic Flat Top with offset pins
  • Camshaft: Hydraulic roller, 222°/230° @ .050", .509"/.528" lift, 112° center lobe
  • Rockers: 1.5:1 Aluminum full roller self-aligning
  • Cylinder Heads: Aluminum Fast Burn 62cc chamber, 210cc intake runners, 2.00" hollow stem intake/1.55" sodium-filled exhaust valves, LT4 Corvette valve springs and lightweight retainers,
    D-shaped exhaust ports, dual intake bolt pattern, and standard & centerbolt valve cover patterns

    Additional Parts Included
  • 8" balancer
  • 12-3/4" automatic flexplate
  • 4-quart oil pan with windage tray (5-quart capacity with PF35 filter)
  • Painted valve covers with oil cap (provisions for PCV breather)
  • Composite plastic front timing cover
  • Engine oil dipstick and tube (passenger side)
  • Brass freeze plugs
  • Fuel pump block-off plate
  • Engine lift tabs

    Recommended Components
  • Long, cast iron water pump (standard V-belt rotation with 1979-86 power steering pump boss)
  • Vortec Single Plane Manifold #809-12496822 (to achieve 425 HP)
  • Vortec Dual Plane Manifold #809-12366573 (when hood clearance is a problem; peak power may decrease 15-20 HP)

    Warranty Information

    These kits, put together by JEGS Professionals, include:

  • GM Performance Parts ZZ383 Engine
  • GM Performance Parts Intake Manifold"
  • JEGS Intake Gaskets
  • JEGS Intake Manifold Bolts
  • Holley 4150 Street HP Carburetor
  • JEGS Dual Feed AN Fuel Line Kit
  • JEGS Fuel Pressure Gauge
  • JEGS Carburetor Stud Kit
  • JEGS RTV Silicone Gasket Maker

    GM Warranty



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    		809-12498772
    		GM Performance Parts ZZ383 Engine
    More info on GM Performance 12498772
    Dyno Chart for GM Performance 12498772 Installation Instructions for GM Performance 12498772
    		$5,299.99
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    		809-12498772K
    		GM Performance Parts ZZ383 Engine Kit
    More info on GM Performance 12498772K
    $189.00
    Dyno Chart for GM Performance 12498772K Installation Instructions for GM Performance 12498772K Easy Kits
    		$6,225.99
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