ATK Engines HP89C GM High Performance 350 Long Block Crate Engine
ATK Engines HP89C GM High Performance 350 Long Block Crate Engine is a engine assembly listing intended for buyers seeking a specific replacement, restoration, or performance application. Review the model and configuration details carefully before ordering to ensure the correct match for your vehicle or build.
Product Highlights
- Product identification: ATK Engines HP89C GM High Performance 350 Long Block Crate Engine
Technical Specifications
| Engine Specifications | • HP: 390• TQ: 420• Block: OE roller block 4 bolt main 1pc seal 1996-2000• Bore/Stroke: 4.040” x 3.480”• Displacement: 350CI• Crankshaft: OE Reground external balance rear of the crank/internal balance front of the crank• Rods: OE powder metal 5.7”• Pistons: Hypereutectic 10:1 Compression• Rings: Moly• Camshaft: Hyd. Roller• Cam Specs: 220/224 @50 .528in/.536ex 110LSA• Timing Chain: Double Roller• Cylinder Heads: ATK High Performance aluminum with 2.020 in. /1.600 ex. valves• Rocker Arms: Billet aluminum roller rockers 1.6 ratio• Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some corvettes and 62-67 chevy II’s)• Oil Pump: Melling STD Volume• Flexplate/Flywheel: Externally Balanced – Pioneer #FRA-159• Balancer: Internally Balanced – PowerBond #PB1046-N• Intake Manifold: ATK dual plane intake• Distributor: HEI (Iron Gear)• Water Pump: OE long pump• Carburetor: Quick Fuel 680CFM Vacuum secondary’s electric choke #HR-680• Fuel Pump: Mechanical fuel pump• Spark Plugs: Autolite #3923• Spark Plug Wires: 8mm Engine Info:• Oil: Conventional / Non Synthetic 10W30• Oil Filter: Wix or K&N• Timing: 34-36 Degrees• Spark Plug Gap: .035”• Firing Order: 18436572• Octane: 91+• Stall Converter: 2200-2800• Exhaust: 1 5/8 Headers Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary. SpecificationsCrate Engine Type: Long BlockEngine Displacement: 350 cu. in.Horsepower: 390 horsepowerCompression Ratio: 10.1:1Torque: 420 ft./lbs.Camshaft Type: Hydraulic RollerCylinder Head Material: AluminumPiston Material: Hypereutectic AluminumCamshaft Duration (.050 in): 220° intake / 224° exhaustCamshaft Lift (in): .528 intake / .536 exhaustBore x Stroke (in): 4.040" x 3.480"Carburetor Included: YesIntake Manifold Included: YesDistributor Included: YesConnecting Rod Material: Powdered MetalValve Covers Included: YesEngine Balance: InternalCylinder Heads Included: YesRear Main Seal Style: 1-pieceThrottle Body Included: NoOil Pan Included: YesTiming Cover Included: YesWater Pump Included: YesHarmonic Balancer Included: YesFlexplate Included: YesFlywheel Included: NoAir Cleaner Included: NoSpark Plugs Included: YesSpark Plug Wires Included: YesComputer Included: NoWiring Harness Included: NoRecommended Fuel: 91 OctaneSpark Plug Style: StockBrand: ATK Engines |
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| Product name | ATK Engines HP89C GM High Performance 350 Long Block Crate Engine |
| Store SKU | 238e64d02322 |
Compatibility & Fitment
Engine compatibility depends on vehicle year, engine family, mounts, accessories, sensors, fuel delivery and emissions equipment. Verify the exact assembly configuration and required supporting parts before purchase.
What’s Included
Package contents depend on the exact manufacturer part number and whether the listing is a complete assembly, long block, short block, bare block, or transmission package. Only components explicitly stated in the product specifications or confirmed by the seller should be considered included.
Installation & Care
Follow the manufacturer’s installation, fluid, break-in, and maintenance instructions. Inspect all mating components and connections before first operation. Use the fluids and consumables specified for the exact application.
Warranty Information
Warranty coverage, duration, exclusions and any core-return requirements must be confirmed for this exact product before purchase. A 3-year store warranty should be advertised only if it is actually offered for this SKU under published store terms; manufacturer warranty may differ.
Important Product Information
Photos may show optional or illustrative components. Fitment, stock status, shipping requirements and installation accessories should be confirmed before ordering. Professional installation is recommended where applicable.
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