ATK HP74 Chevy 350 Vortec 1996-2000 Truck Base Engine 315HP

This engine is an upgrade for 1996-2000 Chevy trucks or SUVs the ECM must be tuned and headers are needed to get the full potential out of this engine. We test this engine with an aftermarket EFI system on an engine dyno, power ratings may vary. Your engine may not necessarily come with all components listed, but they are listed as our recommendations of parts to run for optimal performance. Engine Specifications: HP: 315 TQ: 400 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 crank/internal balance front of the crank Rods: OE powder metal 5.7” Pistons: Hypereutectic 9.3:1 compression Rings: Moly Camshaft: Hyd. roller Cam Specs: 198/210 @50 .435in/.462ex 114LSA Timing Chain: Single roller Cylinder Heads: Vortec cast iron 64cc 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 STD volume Recommended Components: Balancer: Internally balanced – PowerBond 8” #PB1487-N Flexplate/Flywheel: Externally balanced – Pioneer #FRA-159 168 tooth Intake Manifold: Stock Distributor: Stock (Iron Gear) Water Pump: Stock Fuel Pump: Stock Spark Plugs: Autolite #605 Spark Plug Wires: Stock Engine Info: Oil: Conventional / Non Synthetic 10W30 Oil Filter: Wix or K and N Timing: 34-36 Degrees Tuning: ECM MUST BE TUNED TO RUN PROPERLY. WITHOUT DOING SO THE ENGINE CAN BE DAMAGED. Spark Plug Gap: .035” Firing Order: 18436572 Octane: 91+ Stall Converter: Stock 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.

Highlights

• Oil: Conventional / Non Synthetic 10W30
• Oil Filter: Wix or K&N per application
• Timing: 34-36 Degrees

Specifications

• Engine Displacement: 350 cu. in.
• Cylinder Head Material: Cast Iron
• Intake Manifold Included: No
• Oil Pan Included: Yes
• Timing Cover Included: No
• Harmonic Balancer Included: No
• Flexplate Included: No
• Flywheel Included: No
• Material Type: Cast Iron
• MFG. Part #: HP74
• GTIN Code: 00653517269400
• Notes: Designed to fit 1996-2000 Chevy/GMC truck applications. 91 octane or higher fuel is recomended and an ECM tune will be required to have the engine run properly.
• Sold in Quantity: Each
• Brand: ATK Engines

Emissions Notice

Emissions warning: this part is for vehicle engine changes, not direct oem engine replacements. In California, engine changes are legal when done in compliance with California bureau of automotive repairs (bar) engine change policy. For assistance, call bar referee at: (800) 622-7733. And see https://bar.Ca.Gov/consumer/smog_check_program/engine_changes. All customers must comply with federal epa mobile source enforcement memorandum no. 1a (and addendum) and all applicable state regulations when conducting engine changes. Improper installation and/or use of this part in California may subject the installer and/or owner to a $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and laws of all states for use of this engine change part on makes or models of vehicles that render them noncompliant with applicable state and/or federal emission laws with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine