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1997 Chevy Astro LQ4 Swap, Low Power

This is a discussion on 1997 Chevy Astro LQ4 Swap, Low Power within the General Help forums, part of the LSx Technical Help Section category; Try having to rebuild a new engine build just after you just rebuilt it. I chased a tapping noise that ...

  1. #21
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    Try having to rebuild a new engine build just after you just rebuilt it. I chased a tapping noise that for 6 months seemed it was all top end. After I finally pulled the engine again, pulled the oil pan and found this.

    Rod bolt


    That was a new Forged rod



    But that's not all....after rebuilding it again... I been chasing what ended up as a bad vacuum leak. The nuts on the back side of the FAST intake had fallen off making an 8" leak. Got it fixed and the engine is running so much better now that I ready to try a tune again. Almost forgot, one my first tune session the transmission broke on a pull and I had to get it fixed too. LAST YEAR SUCKED.....So the good news is I now have a 403ci stroker.
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

    http://www.ls1.com/forums/f8/my-8-8-rear-build-165553/

    6.0L Block - Forged 403 built, breaking it in , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, Monster Stg 4 Clutch, QT SFI BH, MWC DSL, UMI: SFC, PHB, LCA's, LCA Relocation Brackets & TA, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/4.10 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

    Horsepower never lies, but is often lied about!

  2. #22
    Junior Member
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    1997 Chevy Astro LQ4 4L80

    Wow, yea when this one finally gives up to the ghost I'm going to stroke it and turbo it

  3. #23
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    If your going to turbo it, look into destroking it. Get a custom grind cam that will work for turbos and spin up to 10k.

  4. #24
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    1997 Chevy Astro LQ4 4L80

    Haven't decided yet, gotta mock everything up and see if I'll have room for 2 turbos

  5. #25
    Senior Member Naaman's Avatar
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    Cayanne
    98 Z28 Vert M6



    This thread....

    Glad things are starting to look up, though...

    I don't envy you the issues, though I do wish I had the wherewithal to do this kind of thing myself, but my circumstances just don't permit it...

    And I'm loving that van! Looks like a beast!

  6. #26
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    1997 Chevy Astro LQ4 4L80

    Its a beast when it wants to be
    SMWS6TA likes this.

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