ATK HP31 Chevy 350 87-95 TBI Base Engine 290HP

This engine was designed to run with all your vehicles stock components. Must have a chip burned, upgraded intake and headers for optimal performance.

Engine Specifications:

• HP: 290
• TQ: 373
• Block: OE block 4 bolt main 1pc seal 1987-1995
• 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 9.1:1 compression
• Rings: Moly
• Camshaft: Hyd. roller
• Cam Specs: 198/210 @50 .435in/.462ex 116LSA
• Timing Chain: Double roller
• Cylinder Heads: OE TBI cast iron 67cc 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 #PB1046-N
• Flexplate/Flywheel: Externally balanced – Pioneer #FRA-159
• Intake Manifold: OE or Edelbrock TBI intake #3704
• Spark Plugs: Autolite #605
• Spark Plug Wires: Factory replacements
• Water Pump: OE
  Engine Info:
  
• Oil: Conventional / Non Synthetic 10W30
• Oil Filter: Wix or K and N
• Timing: Set To Factory Specifications Via PCM Module – Must have Performance Chip Burned
• Spark Plug Gap: .035”
• Firing Order: 18436572
• Octane: 91+
• Stall Converter: Stock
• Exhaust: 1 5/8 Headers
  Notes:
  
  Engine is meant for the 1987-1995 Chevy Trucks with a 350 TBI engine. ECM needs a chip burned to run properly.
  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.