ATK HP57 Chevy 350 Base Engine 1987-1991 Corvette

This engine is a performance replacement for 87-91 Corvettes, smooth idle great daily driver. Engine Specifications: HP: 289 TQ: 370 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 the crank/internal balance front of the crank Rods: OE powder metal 5.7” Pistons: Hypereutectic 10:1 Compression Rings: Moly Camshaft: Hyd. Roller Cam Specs: 207/214 @50 .411in/.428ex 112LSA Timing Chain: Double Roller Cylinder Heads: Edelbrock performer aluminum 60cc/165cc 2.02/1.60 Rocker Arms: Stamped steel rockers 1.6 ratio Oil Pan: Rear sump 5qt (Standard SBC oil pan, may not fit some Corvette’s. If not, you must use your original oil pan) Oil Pump: Melling STD Volume Recommended Components: Flexplate/Flywheel: Externally Balanced – Pioneer #FRA-159 Balancer: Internally Balanced – PowerBond 6.75” #PB2221-N Intake Manifold: Stock TPI Intake Distributor: Stock Distributor (Iron Gear) Water Pump: Stock Fuel Pump: Stock Spark Plugs: Autolite #3926 Spark Plug Wires: Stock Engine Info: Oil: Conventional / Non Synthetic 10W30 Oil Filter: Wix or K and N Timing: 34-36 Degrees (set with ECM) 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
• Spark Plug Gap: .035”

Specifications

• Engine Displacement: 350 cu. in.
• Cylinder Head Material: Aluminum
• Intake Manifold Included: No
• Oil Pan Included: Yes
• Timing Cover Included: No
• Harmonic Balancer Included: No
• Flexplate Included: No
• Flywheel Included: No
• Material Type: Iron
• MFG. Part #: HP57
• GTIN Code: 00653517147395
• 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