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ATK Engines High Performance Crate Engine GM LS 5.3L 385HP / 390TQ

059-HP97

made in usa

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High Performance Crate Engine GM LS 5.3L 385HP / 390TQ
$3,833.00
Truck Freight: $184.99
High Performance Crate Engine
  • GM LS 5.3L
  • 385HP / 390TQ
  • Base Engine
  • Estimated to ship direct from manufacturer on 11/10/22 , pending manufacturer availability. Learn More

    Thank you! We will notify you when this product becomes available.

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    HP97 is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from Great engine I bought this eng from jegs and installed it in august 2018. Broke it in with conventional oil and zinc additive following manufacturers instructions, my truck had 270,000 miles on it. I’m writing this July 2022 and now have 314,492 miles on my truck and the engine runs beautifully. Same power at low rpm as the L33 eng that it replaced, but once you take it above 2800 rpm it has a whole new personality. I reused the stock injectors and exhaust and they seem sufficient for my use. My biggest surprise is the good gas mileage I get . I have 3.42 gears which gives me 16-22 mpg on the hiway(depending on the wind direction.haha) at 68-70mph with my 5000#+, 2005 Silverado z71 4x4. I read some bad reviews on this engine, but they don’t align with my experience. Makes me wonder if they followed installation and break in instructions.
    Date published: 2022-07-20
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    So with a truck without AFM like on my 2002 avalanche, theres no way i can start the engine without computer tuned?

    Asked by: Jison
    You can start this engine, but will need a tune to make it work properly.
    Answered by: Rusty B
    Date published: 2018-09-21

    Can this engine be used in a 1979 el camino

    Asked by: Jina
    This is an LS series engine so you will need a complete engine swap kit to use this in your application.
    Answered by: Rusty B
    Date published: 2018-09-20

    can this be placed in a 1979 chevy el camino

    Asked by: jina
    This is an LS series engine, you will need all of the appropriate components to complete an LS engine swap.
    Answered by: Rusty B
    Date published: 2018-09-20

    Some other LM7 5.3 crate engines that are offered, indicate 2WD or 4WD applications. Why would that differ? Does this engine work in a 4WD application?

    Asked by: mclemore1222
    This is shown to fit either 2wd or 4wd application as shown on the fitment tab.
    Answered by: Rusty B
    Date published: 2018-09-18

    What gives this motor more horse power than the stock 5.3? Does it just have a cam in it or head work and other stuff?

    Asked by: Hayes19
    Hello Hayes, Yes, its a custom grind camshaft matched with upgraded springs and .030 over bore gaining a few cubic inches.
    Answered by: ATK HP Engines
    Date published: 2020-01-13

    Can this engine be used to replace a 2007 avalanche 5.3 with AFM? Would all I need to do is an AFM delete tune to delete this and make this engine work in this application? All other sensors of existing engine work in this application?

    Asked by: PJ Pirate
    The HP97 will not work in place of a AFM engine, as is uses a different blocks, harness, reluctor wheel and ect.
    Answered by: ATK HP Engines
    Date published: 2020-08-01

    Was the motor dyno'd with aftermarket headers at 385HP, or should someone expect a increase with the headers? 

    Asked by: BenEd
    The 385hp rating was with installed already.
    Answered by: ATK HP Engines
    Date published: 2020-07-09

    so the HP requires aftermarket tuneable ecu?

    Asked by: MNryan
    Yes, in order to see good performance from this engine it will need to be tuned.
    Answered by: Rusty B
    Date published: 2020-08-01
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