Engines and Components› Engines, Blocks and Components

ATK ENGINES

GM 4T45E AUTO 4-SPD

$3,125.00

SKU: A040 T1731AA

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The ATK HP31 is a 350 cubic inch base engine for 1987-1995 Chevrolet Trucks and SUVs with a 350 TBI engine. It produces 292 HP and 373 lb-ft TQ. It features an OE block, 4-bolt main, 1pc seal, 4.040” bore x 3.480” stroke, reground crankshaft, OE powder metal 5.7” rods, hypereutectic 9.1:1 compression pistons, moly rings, hydraulic roller camshaft, double roller timing chain, OE TBI cast iron cylinder heads, stamped steel 1.5 ratio rocker arms, rear sump 5-quart oil pan, and a Melling STD volume oil pump.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandATK ENGINES
Part NumberA040 T1731AA

Videos

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Was the Chevy 350 TBI Truly “Bulletproof” or Just Overhyped?
THE EXPLOSIVE TRUTH BEHIND CHEVY BULLETPROOF 350 TBI ENGINE

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ATK 350 Engine Swap Review

ATK 350 Engine Swap Review
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Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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