LS-Swapped GNX Clone: 1987 Grand National

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As we well know, a genuine Buick GNX is a bona fide collector’s item these days. This also means you’re not going to get into one for less than $30,000 unless it’s a total dumpster fire of a car. And frankly, extra nice Grand Nationals aren’t far behind. This seller has addressed these potential barriers to entry by building a GNX clone, and while it’s not done yet, a fair amount of work has been completed, with the most important boxes checked: a very over-built drivetrain and the must-have color-matched GNX basketweave wheels. The seller notes the interior needs assembly and some re-work, and that the paint is so-so with the occasional spot of Bondo. Find the 1987 Grand National GNX clone here on craigslist for $12,000.

It’s amazing what a difference the wheels make, along with the fender flares: looking quickly, I might make the assumption this is a real-deal GNX. The tinted windows and taillights contribute to the all-blacked-out look, which may seem excessive to some Grand National shoppers. I do think non-tinted glass would actually work in this car’s favor as a way to reduce the perception that it’s an overly-modified example; however, that’s a purely subjective concern. While the seller is upfront about the paint being driver-quality, it at least looks good in pictures. There is some filler in the bottom of the doors and fenders and a few patched spots in the floors, but no other rust concerns are divulged.

Now, let’s remember something: the seller has poured his efforts and attention into the drivetrain, and my hat is off to him for that. He’s leaving the interior to the next person, and I don’t blame him. The cabin is an easy problem to fix, especially considering how well this GNX replica would respond to a retro-modded cabin with black leather Recaro seats and a corresponding rear bench; the seller actually acknowledges that the backseat has already been upgraded with a “…rear seat from an AMG Mercedes,” but no photos are included. Sounds intriguing, whatever it is. He will include new carpeting as part of the deal and notes the dash has been dyed to mimic the standard GNX cabin.

The 6.0L LS engine was rebuilt with all-new pistons and rods that the seller claims are the “…exact same rotating assembly put in the LS2 Corvette.” He further notes that the piston rings are gapped for boost which makes it an ideal set-up for adding a supercharger, turbocharger, or nitrous to this mill later down the road. Other details include Holley engine and transmission mounts that position the engine perfectly in the bay, with no driveline vibration noted. The seller feels his GNX clone rides and drives better than most LS-swapped cars, but you’ll just have to drive it to find out. He adds extra temptation by noting that turbocharging or supercharging this engine will yield a potentially nine-second car, which would be pretty incredible for a $12,000 investment.

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Comments

  1. bobhess bobhessMember

    This could be a neat car when completed. Something to have some fun with vs. having the real thing to worry about paint chips etc.. Write up indicates the engine swap was properly done but it is obvious that the builder is not an electrician.

    Like 12
    • chrlsful

      ‘…builder is not an electrician….”
      my thought – said differently
      8^ 0

      rather the oe but a good move if the components R gone~

      Like 0
  2. Claudio

    The turbo sound is gone
    The v6 had a pretty good whine
    But being an LS lover, this is a good thing at a reasonable price
    I would consider it if the top was made out of rag

    Like 1
  3. Claudio

    You lose and you gain
    You lose the v6 and the cool whining
    You gain the v8
    You gain LS power
    You can drive this one
    And you can hop it up a lot
    If this were a ragtop
    I think i would consider

    Like 0
  4. CCFisher

    I suggest you buy any GNX you can find for under $30,000, no matter how rough. The value guides put a GNX at just under $70,000 on the low side.

    Like 4
    • Frank Sumatra

      Good point. When I saw the $30000 my first thought was “Where? and How fast can I get there”

      Like 0
  5. Marko

    A little more cash and some thought would finish this Buick up into one heck of a wolf in sheeps clothing. It would make a terrific driver, and not being a real GNX, you don’t have to tremble in fear of it getting a dent in it, and losing half of its value.

    For $12k, I think it is a great starter.

    Like 3
    • Matt G

      More like a wolf in another wolf’s clothing, nothing sheepish about a GNX!

      Like 4
  6. bigbird

    Looks good for a great start. Keep the LS motor like it is. Don’t start throwing turbos and superchargers on it. You got rid of the biggest headacre the turbo-V6, I would super sanitize the under hood, clean it up so you know where all connections go, and they are relilable. Not a fan of automatics, so since one will never be perfect again, how about a 6-speed with a great looking interior? Good car for the money….

    Like 2
  7. Troy s

    If Buick had built the GNX today this engine would be in it, pushed to the limits. Imagine a G body with a screaming 366 cube LS, manual transmission, instead of the dody 305 or even turbo whoosh v6,, now that would have been somethin else. Nothing, nothing beats the sound of a tuned V8.

    Like 0
  8. nycbjrMember

    crack pipe ;-)

    Like 0
  9. Terry Bowman

    How can anyone call this GN a clone GNX ? Wrong motor, I’m sure it does not have the special rear end and what #car is on the dash face? Could it be a Cool ride, Yes, a clone, No !!!!

    Like 0
    • Claudio

      It is certainly a clone when its driving past you on the highway or you’re passing by it on a street

      Like 1
  10. adam

    Why not stay true to the roots and put an ls based v6 with a turbo? the 4.3L LV3 gets you 285 horses with 300 ft lbs add a turbo and you got something cool that is super quick off the line and is true to the soul of the car

    Like 0

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