Description
ATK Engines HP89 Small Block Chevy 350 Base Engine, 390HP
Great crate engine with a noticeable idle, very street able with lots of power.
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
Recommended Components:
• 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: Holley mechanical 110GPH #12-327-11
• 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.
These engines are year and model specific. All cores must be returned to ATK as they will provide the bill of lading and schedule the pickup once contacted.
Do NOT return cores to Speedway Motors.
| KEY SPECS | |
|---|---|
| MFG. Part # | HP89 |
| Brand | ATK Engines |
| Crate Engine Type | Long Block |
| Engine Displacement | 350 cu. in. |
| Horsepower | 390 horsepower |
| Compression Ratio | 10.0:1 |
| Torque | 420 ft./lbs. |
| Camshaft Type | Hydraulic Roller |
| Cylinder Head Material | Aluminum |
| Piston Material | Hypereutectic Aluminum |
| Spark Plug Style | Stock |
| 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 | No |
| Intake Manifold Included | No |
| Distributor Included | No |
| 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 | No |
| Harmonic Balancer Included | No |
| Flexplate Included | No |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | No |
| Spark Plug Wires Included | No |
| Computer Included | No |
| Wiring Harness Included | No |
| Accessory Bolt Holes Drilled | No |
| Recommended Fuel | 91 Octane |
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