ATK Engines HP74 High Performance Crate Engine Small Block Chevy Vortec 350ci / 315HP / 400TQ
059-HP74
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ATK Core Return Process
JEGS and ATK appreciate your business and want to ensure that your core return is as smooth as possible.
Please CLICK HERE for ATK Core Return Process
NOTE:
- Core return can be any Small Block Chevy 350ci engine, except 1992-1997 LT1 style engines
Engine Specifications
This engine is an upgrade for 1996-2000 Chevy trucks with a Vortec 350. The ECM must be tuned and headers are needed to get the potential out of this engine.
- Horsepower: 315 hp
- Torque: 400 lb/ft
Block Information:
- Seasoned OE 4 bolt main 1pc seal 1996-2000
- Bore/Stroke: 4.040" x 3.480"
- Displacement: 350ci
Rotating Assembly:
- Crankshaft: OE Reground 1 piece seal crank
- Balance: External rear, internal front
- Rods: OE powder metal 5.7"
- Compression Ratio: 9.3:1
- Pistons: Hypereutectic
- Rings: Moly
Camshaft Specs:
- Camshaft: Hydraulic roller
- Cam Duration @ .050": Intake 198 / Exhaust 210
- Cam Lift: Intake .435" / Exhaust .462"
- Lobe Separation Angle: 114lsa
- Timing Chain: Single roller
Cylinder Head Information:
- Cylinder Heads: Vortec cast iron
- Combustion Chamber: 64cc
- Valve Size: 1.94" Intake / 1.50" Exhaust
- Rocker Arms: Stamped steel 1.5
Oil Pan Information:
- Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some Corvettes, and 1962-1967 Chevy II's
- Oil Pump: Melling standard volume
Base Engine
- Short Block
- Camshaft
- Timing Set
- Cylinder Heads
- Valve Covers
- Timing Cover
- Oil Pan
- Oil Pump & Pickup Tube
Engine Info
- Exhaust: 1-5/8" Headers
- Firing Order: 18436572
- Octane: 91+
- Oil: 10W30 (Conventional / Non Synthetic)
- Oil Filter: Wix or K&N
- Spark Plug Gap: .035"
- Stall Converter: Stock
- Timing: 34-36 Degrees
- Tuning: ECM MUST BE TUNED TO RUN PROPERLY. WITHOUT DOING SO THE ENGINE CAN BE DAMAGED
Recommended Components
- Balancer: Internal balance 8"
- Distributor: Stock (iron gear)
- Flexplate/Flywheel: External balance 168 tooth 1987-Up
- Intake Manifold: Edelbrock Performer RPM #350-7116
- Fuel Pump: Stock
- Spark Plugs: Autotile #417-605
- Spark Plug Wires: Stock
- Water Pump: Stock
Disclaimer: The parts listed are ATK's recommendations of parts to be used to obtain the power figures listed. Power figures can vary based on parts used by the end user. Some modifications to the vehicle may be required using these and or other aftermarket parts.
Engine Break-In Procedure
Use or break-in oil or conventional (non-synthetic) 10w30 oil with zinc additive for the first 500 miles of operation. Do not drive for long periods at any single speed, always vary your speed. Do not tow a trailer or put other heavy loads on the vehicle. It is best to avoid long periods of idling during this period. Check the engine oil and coolant levels daily.
Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. Let the engine cool down completely and repeat process 2-3 more times. Do not idle the engine for any extended period at this time, this is critical to break in the camshaft.
At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil with a zinc additive. Check fuel and ignition settings, adjust valves (where applicable). Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading or long periods of idling.
Change the oil and oil filter again at 1,000 miles. Continue using conventional (non-synthetic) oils and zinc additive, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. Use of oil with zinc or a zinc additive for the life of your engine is recommended.
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Specifications:
Hello would this be direct fit replacing my 5.0 305 fuel injection on my 1996 Chevy Silverado c1500 ? Also with the new motor would my current transmission 4l60e work with it?
Some of the engine parts on the engine swap are performane brands , like the distributor, an throttle body, would this a problem to swap over to this 5.7?
will this engine fit into my 1973 GMC 1500?
Will I pass an emission test with motor if I put it in a 96 Chevy Tahoe
will this engine fit in a monte carlo ss?
Should you use direct injection or go carb? I thing factory 1997 came with direct injection but just curious what direction to go with my build? Just looking for a little guidance and wanting the best to make it reliable
Good day, will this fit my 1999 obs 4wd suburban? Also do you freight to New Zealand? Thank you
Is there a warranty with this engine?
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.