1987 Buick Grand National

Description

Selling my 1987 Buick Grand National. Had completed numerous projects on this car through nine years of ownership. Invested thousands in the best aftermarket parts, kept all receipts. Despite being quite modified, it’s still street legal. The parts were more about fixing or improving where the car was lacking. This GN is unique for its model year and came with power windows, power door locks, and very rare Astro Roof option. One of the previous owners installed a GNX instrument cluster so the original mileage is unknown. I recently installed a VDO 160-mph speedometer. The car has original paint with some signs of paint cracking in areas shown in photos. The overall paint condition is good for its age and there’s no rusting. Some seals may need to be replaced. I garaged the car and kept it under a wrap the whole time. The car drives fine and is very fast but the next step would be a standalone ProEFI or XFI tune. The car currently runs on gen 6 after-market ECU and is stable with a good idle. All fluids had been changed as I was going through all car systems with the mods; that includes engine oil, coolant, transmission fluid, and brake fluid. The most recent upgrade was a set of Wilwood breaks. New Optima 34/78 battery (1000 cold amp cranking power) and 200-amp alternator. Also new AC compressor, condenser, and AC accumulator. The conversion is charged with R134a refrigerant. Some upgrades were done before my ownership, like hardened piston push rods.
Here's a list of all the mods:
ENGINE
- Engine bored to 3.820, high performance Moly 3.820 piston rings and pistons, hardened pushrods, PTE 218 camshaft, 869-12 hydraulic race lifters, engine custom receiver groove
- 70mm air plenum throttle body with power plate
- ANS Performance ported intake manifold
- Billet aluminum adjustable pressure regulator
- 9.5" torque converter
- Two 255 LPH Walbro fuel pumps
- 12-point ARP head studs
- DEKA 55 lbs injectors, model #3102
- Rollmaster timing chain
- RJC billet aluminum razor racing 8-piece pulley set, weight reduction over 9 lbs, rotating weight reduction of 95 lbs
INTAKE / EXHAUST / COOLING
- Twin fan aluminum radiator combo from GN1 Performance
- Turbonetics CTP 60 series turbo with ball bearings
- RJC intercooler IC-325
- RJC polished aluminum 3" intercooler pipes and polished 4" aluminum turbo inlet pipe
- new ceramic coated headers
- 3" downpipe with external 46mm wastegate
- 3" stainless steel dual exhaust system
- QTP 3" electric cutout exhaust
ENGINE MOUNTING
- Boxed UMI 2" rear lower control arms with polyurethane and roto-joint Delrin bushings
- UMI upper and lower A-arms with Delrin bushings, and new GM Metric spindles (stock height)
- Spohn rear upper tubular adjustable control arms with roto-joints
- Polyurethane body mounts from Energy Suspension
- Spohn performance steering front-end rebuilt kit
BRAKES
- Tallon Hydroboost Brake System Conversion, Wilwood master cylinder and proportioning brake valve
- Wilwood brakes: Front: 6-piston forged Dynapro 6 Big Brake Kit with 12.19" drilled, slotted rotors / Rear: 4-piston forged Dynalite Pro Series with 12.19" drilled, slotted rotors. I also installed an emergency brake from Summit Racing Equipment
TRANSMISSION / DRIVETRAIN
- Transmission 200-4R model, upgraded to Stage 2 by Jimmy's High Performance Transmission in Union Grove, WI.
- Polyurethane transmission mount on the custom billet aluminum bracket support plus transmission cross member poly mounts
- Hughes transmission upgrade to 4" depth, hold extra 2 quarts
- Derale Atomic fan forced cooler, 500 cfm, and Derale fin and plate type 9000 series
- Denny’s Nitrous Ready 3" Driveshaft Pro Package NR-3PRO
- Eaton limited disc slip posi unit, 400 lbs spring-loaded, 28 spline, with new carrier bearings
- Richmond ring gear and pinion gear, 3.90/1 ratio
- Moser C-clip type 28-spline axles with new axle bearings
- TA Performance 8.5" 10-bolt rear-end aluminum cover
SUSPENSION
- Viking front and rear double adjustable coil-overs. Spring rates - 450 lbs front, 150 lbs rear
- UMI rear tower brace for rear reinforcement
- UMI 1.250" solid front swaybar and 1" solid rear swaybar
EXTERIOR / INTERIOR
- CCW wheels (gloss black centers with polished lips, classic street). Front 245/45/17 and Rear 275/40/17 all wrapped in Nitto NT555 tires
- JW Speakers chrome bezel LED headlights, low and high beams
- GNX style gauge cluster (prior owner)
- SpoolFool rear and front bumper fillers
- Grand National logo black valve covers, very hard to find
- 9 piece GM G-body trunk carpet (gray)
- Radiator and vacuum hoses replaced with silicone
- Rear seat X-braces from Kirban
- Front/rear aluminum bumper supports
COSMETIC FLAWS
- Stitching coming apart on upper dashboard
- Paint cracking around sunroof and rear side windows (corners only)
- Some paint showing small wrinkling in a few areas, not cracking yet
- One quarter size chip on lower part of door and few small 1/16” chips on hood
- Cracking seals
- Some blemishes
- Keep in mind this is a 1987 car with no rust. I got caught in rain a couple times and there have been no leaks to the interior.
SERIOUS INQUIRIES ONLY!