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ATK Engines HP97 High Performance Crate Engine GM LM7 5.3L [385 HP/390 TQ]

059-HP97

made in usa

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HP97 High Performance Crate Engine GM LM7 5.3L [385 HP/390 TQ]
$4,144.99
High Performance Crate Engine
  • GM LM7 (LS) 5.3L
  • Horsepower: 385
  • Torque: 390
  • Bore/Stroke: 3.809 in./3.622 in.
  • Block: Cast-Iron
  • Cylinder Heads: Aluminum
  • Crankshaft: Internally Balanced, 24 Tooth Reluctor Wheel w/.857 in. Flange
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    HP97 is rated 4.5 out of 5 by 2.
    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
    Rated 4 out of 5 by from Camshaft upgrade I bought this engine 2 years ago for my son's truck as an upgrade to his 2002 GMC Sierra which originally had a 4.3 v6 . So far it has been a good motor but it is now his second vehicle and we are wanting to beef it up a little bit more could you please let me know the specifics on the cam shaft that is in it now so that we can upgrade it correctly?... Unfortunately the paperwork that came with it has been misplaced.
    Date published: 2023-01-23
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    does this engine need a tune or can it just be swapped and and everything be fine. 

    Asked by: kodi
    The ATK 059-HP97 engine will need a custom tune if using in a factory EFI application.
    Answered by: jshook
    Date published: 2024-04-22

    Will this work on Monte Carlo as 5.3ls 

    Asked by: Tee3hreee
    Hello, if youre doing a swap it could.
    Answered by: ATK HP Engines
    Date published: 2023-09-27

    Unfortunately I live in a state that hates cars, even though it’s where the car scene started.  Is this engine CARB approved?

    Asked by: MrGrey
    Sorry, we do not CARB test our engines.
    Answered by: ATK HP Engines
    Date published: 2023-07-13

    Will this fit my 2003 Silverado 1500 LT? And will there be any modifications to the harness or any other equipment?

    Asked by: Cris92
    The ATK 059-HP97 engine will bolt to an '03 Silverado and require custom computer tuning.
    Answered by: jshook
    Date published: 2023-06-08

    Will this fit a 2004 Chevy silverado 1500 4.8 ?

    Asked by: Tony
    The ATK 059-HP97 engine assembly will bolt in place of a 4.8. Custom tuning will be required.
    Answered by: jshook
    Date published: 2023-06-13

    Would this fit in my 06 Chevy 1500?

    Asked by: Jacks
    Hello Jacks, yes it will. A tune is required prior to start up to avoid detonation and fuel washing.
    Answered by: ATK HP Engines
    Date published: 2023-05-09

    It says it requires 91+, but could I run on 89 octane?

    Asked by: Godti
    The ATK 059-HP97 engine assembly is designed for 91+ octane.
    Answered by: jshook
    Date published: 2024-05-09

    Will this be a direct replacement for a 07 flex fuel 5.3 and what are the cam specs for the motor 

    Asked by: Moore85
    The ATK 059-HP97 engine assembly is not a direct replacement for an '07 flex fuel application.
    Answered by: jshook
    Date published: 2023-10-27
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