Engines and Components› Engines, Blocks and Components

ATK ENGINES

GM 4L80E AUTO 4-SPD

$3,347.23

SKU: A040 T1670CA

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

Advanced — 4+ hours

Description

The ATK ENGINES T1670CA, also known as ATK HP99C, is a complete 350CI Vortec engine assembly producing 290HP and 375TQ. It features an OE roller block, 2-bolt main, and a 1-piece seal, suitable for 1996-2000 applications. Key components include a reground OE crankshaft, hypereutectic pistons with 9.4:1 compression, and Vortec cast iron cylinder heads. It comes with a Quick Fuel Brawler 670CFM carburetor and requires an electric fuel pump due to no mechanical fuel pump provisions.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

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

Available on iOS & Android

Specifications

BrandATK ENGINES
Part NumberA040 T1670CA

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.

View Full Return Policy