ATK HP291PC Chevy 350 Complete Engine 325HP

Item #31964 Brand:ATK Engines

ATK HP291PC Chevy 350 Complete Engine 325HP
ATK HP291PC Chevy 350 Complete Engine 325HP
* ** THIS ITEM IS TEMPORARILY OUT OF STOCK *** FREE SHIPPING on ATK Engines. This item ships directly from the manufacturer and is not available for store pickup. Some engines are made-to-order or can be backordered. Delivery can be delayed up to 5 to 6 weeks but typically ship within 2 weeks.

*Truck Freight Delivery Notice - Driver will only deliver this item to your curb. It is your responsibility to transport the item from curb to your garage.

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ATK HP291PC Chevy 350 Complete Engine, or Stage 3 Engine, is designed for those that are wanting to drop the engine into their project and fire it up. We try to outfit the engine as completely as possible to save you time and headaches. A GM Complete Dress engine typically consists of the Stage 2 build out plus the following: Carburetion, Spark Plug Wires, & Spark Plugs.

Engine Specifications:

  • 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: Dart 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
  • 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

ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty.

Engine Paint


ATK HP291PC Chevy 350 Complete Engine 325HP


Engine Information:

Oil Conventional / Non Synthetic 10W30 with Comp Cam zinc additive #159 for first 3000 miles
Oil Filter Wix or K&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
Weight 450 lbs.

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.

Shipping Instructions and Core Information

Shipping is free and lift gate will be provided.

There is no core charge for this engine. You will not be required to send a core back to the manufacturer.

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