Twin Turbocharged LSA Swapped 1987 Buick Grand National

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Images Source: tdishon of LS1Tech.com

A few weeks ago, we showed you a video of a Turbocharged 6.0 liter LQ9 V8 Swapped Grand National this week we’ve found one that’s bringing even more power to the table.

This our friends, is a twin-turbocharged (and factory supercharged) 6.2 liter LSA swapped 1987 Buick Grand National and it only has 5,200 original miles on it.

Before the original turbocharged 3.8 liter V6 engine was removed, the owner comments that the car was stroked to 4.1 liters and tuned for E85 fuel.

The original turbocharged 3.8 liter V6 engine was stroked to 4.1 liters and tuned to run on E85 fuel before being removed.

The project comes from forum user tdishon via LS1Tech.com. The owner comments a lot of work went into this swap, and some of you may be asking yourselves why someone would want to LS swap an original Grand National with such low mileage in the first place. It’s a valid question, and we’re all fans of the last muscle car offered by Buick.

The owner comments in the thread that this specific car was his dream car, ever since he graduated high school. He had always wanted one, and dreamed of making the car even faster. He admits he got a lot of flack from other forum members on the Grand National forums, however, that didn’t stop him from fulfilling his dreams of purchasing a low mileage and rust-free starting point for his project.

The engines arrival.

Modifications such as reinforcing the frame, swapping the factory K-member, and the entire cooling system being overhauled have taken place to make this swap possible. Custom F-body engine mounts from Spohn Performance were used used to house the new LSA engine.

An Alan Grove Vintage Air condition conversion kit has been installed on the new LSA engine to improve space in the bay, along with brand new accessories from GM. The car even has power steering.

The owner

The owner also comments that the suspension has been updated as well, utilizing a Baer brakes and a Detroit Speed differential.

Transmission duty has been assigned to a custom-built Lonnie Diers Extreme Stage III 4L80E, and it’s a tough one. The owner had a custom billet gear set made for 1st and 2nd gear (which uses the same ratio as the 200R4). A shorter than stock driveshaft had to be used as well, and a longer shifter stick was necessary to utilize the neutral safety switch and reverse lights. Everything is housed through a Summit Racing Transmission Crossmember.

Here is the icing on the cake. These are twin 57mm billet turbochargers from Garrett.

The compound setup puts down a healthy 965 horsepower and 931 lb-ft of torque to the rear wheels on it’s highest setting. It’s been tuned by Forced Induction Tuning, located in Phoenix, Arizona to use E-85 on 24 pounds of boost from the turbos (the supercharger pulley has been left stock).

As of this time, the owner is currently having an all-wheel-drive system tested on a donor ’86 Buick Regal, which he plans to use in this ’87 GN. We’re excited to see what’s next for this car, as there’s so much more information in the owners build thread. We recommend checking it out, as this has to be one of our favorite projects we’ve come across lately.

The final product of the swap looks so well, you could almost claim it looked completely factory.

The final product of the swap looks so well, you could almost claim it looked completely factory.

About the author

Harrison Noble

Living in San Diego for most of his life, Harrison was exposed to a variety of cars at an early age. His passion for anything that is fast, or has a V8, brought him to Power Automedia.
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