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

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#35020146

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

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

$3,495.99

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Product Summary

Long Block Crate Engine Type, 9.1:1 Compression Ratio

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

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Key Specs

Crate Engine Type	Long Block
Compression Ratio	9.1:1
Engine Displacement	350 cu. in.
Camshaft Type	Hydraulic Flat Tappet
Cylinder Head Material	Cast Iron

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Made to Order

This custom item will ship when completed

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ATK Engines HP31 Details

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.

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Warranty (ATK Engines)

Technical Information (ATK Engines)

CARB Warning

Follow EPA, CARB, and state regulations for engine changes

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

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

CARB warning

ATK Engines HP31 Specifications

KEY SPECS
MFG. Part #	HP31
Brand	ATK Engines
Crate Engine Type	Long Block
Compression Ratio	9.1:1
Engine Displacement	350 cu. in.
Camshaft Type	Hydraulic Flat Tappet
Cylinder Head Material	Cast Iron
Piston Material	Hypereutectic Aluminum
Carburetor Included	No
Intake Manifold Included	No
Distributor Included	No
Valve Covers Included	Yes
Cylinder Heads Included	Yes
Throttle Body Included	No
Timing Cover Included	No
Oil Pan Included	Yes
Water Pump Included	Yes
Harmonic Balancer Included	No
Flexplate Included	No
Flywheel Included	No
Air Cleaner Included	No
Spark Plugs Included	No
Spark Plug Wires Included	No
Computer Included	No
Wiring Harness Included	No

GENERAL
Bore x Stroke (in)	4.040" x 3.750"
Material Type	Cast Iron
GTIN Code	00653517143144
Sold in Quantity	Each

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