ATK HP291P Chevy 350 Base Engine 325HP

Item #31963 Brand: ATK Engines

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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 for 4-5 weeks but usually ship within 3 days.

Orders placed for this item cannot be canceled or changed.

Details

ATK HP291P Chevy 350 Base Engine, or Stage 1 Engine, is designed for those that may have their own component parts already and who also are interested in completing out the build themselves. A GM base engine typically consists of the following: Short Block, Camshaft, Timing set, Cylinder heads, Valve covers, Timing cover, oil pan, oil pump & pick up tube.

Engine Specifications:

HP: 330

TQ: 3380

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

Classic 350 with great street manners, and vacuum for all your power accessories. Your engine may not necessarily come with all components listed, but they are listed as our recommendations of parts to run for optimal performance.

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(1) ATK HP291P Chevy 350 Base Engine 325HP

Specifications

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: 410 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.

Warranty

2 Year Manufacturer Warranty

Accessories

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