Description
ATK HP291P Chevy 350 Base Engine 325HP
Classic 350 with great street manners, and vacuum for all your power accessories.
- HP: 330
- TQ: 380
- Block: OE block 4 bolt main 1pc seal 1987-2000
- Bore/Stroke: 4.040 x 3.480
- Displacement: 350
- Crankshaft: OE Reground external balance rear of crank/internal balance front of the crank
- Rods: OE powder metal 5.7″
- Pistons: Hypereutectic 9.1:1 compression
- Rings: Moly
- Camshaft: Hyd. flat tappet
- Cam Specs: 224/234 @50 .465in/.488ex 112LSA
- Timing Chain: Double roller
- Cylinder Heads: ATK cast iron 76cc/165cc 1.94/1.50
- Rocker Arms: Stamped steel 1.5 ratio
- Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some corvettes and 62-67 chevy II’s)
- Oil Pump: Melling high volume
Recommended Components:
- Balancer: PowerBond internal balance 8″ #PB1046-N
- Flexplate/Flywheel: Pioneer #FRA-159 external balance 168 tooth
- Intake Manifold: Weiand stealth dual plane #8150
- Distributor: HEI (Iron gear)
- Water Pump: OE long pump
- Carburetor: Quick Fuel 680CFM vacuum secondary’s with electric choke #HR-680
- Fuel Pump: Holley mechanical 110GPH #12-327-11
- Spark Plugs: Champion #RV12C
- Spark Plug Wires: 8mm
Engine Info:
- Oil: Conventional / Non Synthetic 10W30 with Comp Cam zinc additive #159 for first 3000 miles
- Oil Filter: Wix or K and N per application
- Timing: 34-36 Degrees
- Spark Plug Gap: .035″
- Firing Order: 18436572
- Octane: 91+
- Stall Converter: 2200-2500
- 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.
| KEY SPECS | |
|---|---|
| MFG. Part # | HP291P |
| Brand | ATK Engines |
| Engine Displacement | 5.7 liters |
| Compression Ratio | 9.1:1 |
| Camshaft Type | Hydraulic Flat Tappet |
| Cylinder Head Material | Cast Iron |
| Carburetor Included | No |
| Intake Manifold Included | No |
| Distributor Included | No |
| Valve Covers Included | Yes |
| Engine Balance | Internal/External |
| 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 |
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