ATK Engines HP89C GM High Performance 350 Long Block Crate Engine

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. Specifications Crate Engine Type: Long Block Engine Displacement: 350 cu. in. Horsepower: 390 horsepower Compression Ratio: 10.1:1 Torque: 420 ft./lbs. Camshaft Type: Hydraulic Roller Cylinder Head Material: Aluminum Piston Material: Hypereutectic Aluminum Camshaft Duration (.050 in): 220° intake / 224° exhaust Camshaft Lift (in): .528 intake / .536 exhaust Bore x Stroke (in): 4.040" x 3.480" Carburetor Included: Yes Intake Manifold Included: Yes Distributor Included: Yes Connecting Rod Material: Powdered Metal Valve Covers Included: Yes Engine Balance: Internal Cylinder Heads Included: Yes Rear Main Seal Style: 1-piece Throttle Body Included: No Oil Pan Included: Yes Timing Cover Included: Yes Water Pump Included: Yes Harmonic Balancer Included: Yes Flexplate Included: Yes Flywheel Included: No Air Cleaner Included: No Spark Plugs Included: Yes Spark Plug Wires Included: Yes Computer Included: No Wiring Harness Included: No Recommended Fuel: 91 Octane Spark Plug Style: Stock Brand: ATK Engines