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For Sale: Twin Turbo V8 Buick GN





For Sale 1986 GN.

Extremely nice 86 GN with Duttweiler Twin Turbo V8
Car was stripped to the metal and repainted. Car had zero rust or damage.
Car built by Duttweiler and has approximately 2000 miles since built and about 35 passes at 1/8 and 1/4 mile tracks, combined.
I have made only 3 passes on the car. The Torque Converter, has a stock stall and at idle car will drive.. My passes consisted of leaving at 2000 RPM with 5 lbs boost and ran 12 lbs boost during run. Car ran a 10.3 with a 1.9 60ft and 139.5 MPH. The car has too low a gear ratio (3.9) & with a short tire hit the computer rev limiter at 3/4 track. Top Speed at 7000 RPM is 139.5.
With a 3.4 or 3.3 Ratio car will run mid 9's on 12 LBS boost.
The lowest I can turn down the boost is 12 lbs using a knob on the center council.
Car has manual steering, manual brakes and stops easily from 139 MPH.
According to Dyno Sheet, 12 lbs boost is 802 HP and 702 lbs TQ at the crank.
Dyno Sheet says 17LBs boost makes 1035HP, 780 LBs TQ with HP still climbing.
Engine made 1450 HP on Duttweilers Dyno at Crank.I don't know the boost.

I have used the car primarily for car cruises this summer. Huge crowds wherever it parks. Car runs great on the street. Does not have heater, A/C or wipers.
I have build sheets, Dyno sheets, Motec instructions.
I believe it would cost twice my asking price to duplicate build at Duttweilers, you providing a car?

Duttweiler built 388 cubic inch V8
GM Bowtie block CNC
Compression Ratio 7.58
Scat Crank Forged
Oliver Billet Rods
JE Pistons
Competition Cam Roller, 244/244 at .050
Steel Valves 1.6 INT, 2.08 EX.
Brodix Trac 1 Heads 66 CC Chambers
Duttweiler head work
Crower Lifters
T&D Rockers (shaft) Ratio 1.6 INT, 1.6 EXH
Hogan Sheet Metal Intake
GM Cast Aluminum V/C
MSD Ignition 6AL
MSD Distributor
MSD Coil
2 T-66 BB on Center Turbos
2 Racegates
Spearco Intercooler Core.
Edelbrock T/B
Transmission Shield
Aluminum Double Pass Radiator
8 point Chromoly Cage NHRA legal
New Bushings all around ( 2000 miles)
Glass Hood
Glass Bumpers
New Fillers
SFI Flex Plate
SFI Trans shield
SFI Flywheel shield
GNX Style Dash
Hurst Shifter
Line Lock
Notched Frame
Shift light.


Motec M48
Rev Limiter set 7100 RPM
Max Manifold pressure, 17Lbs = 1034 HP 780 Lbs Torque

Fuel System

2 Paxton Fuel Pumps
2 Paxton Fuel Filters
2 Paxton Regulators
Jaz Fuel Cell

Wheels & Tires

Front 15x4 Weld Alumastar Rims, Moroso Tires.
Rear 15x9 Bogart Wheels, 5/8 studs, M/T 275/60/15


Ford 9" 3.90 spool
Rear Coil overs, adjustable
BMR anti sway bar
Front Coil Overs adjustable for height.


T-400 manual shift.
Trans Brake
Art Carr Converter, 9" stock stall approx. 1800 RPM


Painted 1 year ago and has yet to have final buff and wax.
Stock paint was completely stripped and zero rust.
I have extra painted trunk lid, front and rear bumpers, new
MSD boost control, new rugs still boxed.
I have the emblems.
New window felts installed.

Needs taller Gears.
Needs higher stall converter.
The Speedometer recently started acting eratic.

Price $37,000.00

Duane 206-849-0982


Open to partial trades most models. Prefer outright sale.
Payment Options
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Ad #2048691
Posted: 09/16/2016, ad expires in 44 days
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Seller Information
Ad posted by:
rtviper96 (#333643)

Member Since: 11/12/2008
Phone Number: 2068490982

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106 Main Street, North Adams, MA 01247
Toll Free: 866.326.9227 • Tel: 413.663.3496 • Fax: 413.663.3615 • Email:

Execution Stats: 0.206 sec / 8.3 MB used / 8.4 MB peak