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

Item #31962 Brand:ATK Engines

ATK HP31 Chevy 350 87-95 TBI Base Engine 290HP
ATK HP31 Chevy 350 87-95 TBI Base Engine 290HP
* ** THIS ITEM IS TEMPORARILY OUT OF STOCK *** FREE SHIPPING on ATK Engines. This item ships directly from the manufacturer and is not available for store pickup. Some engines are made-to-order or can be backordered. Delivery can be delayed up to 5 to 6 weeks but typically ship within 2 weeks.

*Truck Freight Delivery Notice - Driver will only deliver this item to your curb. It is your responsibility to transport the item from curb to your garage.

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Don't forget the engine paint!

This engine was designed to run with all your vehicles stock components. Must have a chip burned, upgraded intake and headers for optimal performance. Your engine may not necessarily come with all components listed, but they are listed as our recommendations of parts to run for optimal performance.

ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty.

Engine Paint

ATK HP31 Chevy 350 Base Engine, or Stage 1 Engine, is designed for those that may have their own component parts already and who also are interested in completing out the build themselves. A GM base engine typically consists of the following: Short Block, Camshaft, Timing set, Cylinder heads, Valve covers, Timing cover, oil pan, oil pump & pick up tube.

Engine Specifications:

HP 292
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


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


Oil Conventional / Non Synthetic 10W30
Oil Filter Wix or K&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
Weight 410 lbs.

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.


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

Shipping Instructions and Core Information

Shipping is free and lift gate will be provided.

There is no core charge for this engine. You will not be required to send a core back to the manufacturer.

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