Buy a 1986-87 Grand National only after the body, the turbo V6 and the Powermaster brake system have been inspected separately. Black paint and a loud exhaust say nothing about rust in the lower A-pillars or a cracked left header.
For this November 5, 2026 guide, I relied on the Hemmings Grand National buyer guide for model detail and an appraisal-focused overview for what documentation does to value. So, treat this as an inspection plan, not a valuation.
Confirm it is a real Grand National
A Regal can be dressed in black trim and badges, so confirm the identity from the VIN, build documents and the original equipment before talking price. Hemmings notes Buick built 5,512 cars for 1986 and 20,193 for 1987, and the two years differ in grille trim. If the seller cannot explain how the car was verified, pay Regal money or walk.
Check the turbo V6 for leaks and header cracks
Hemmings points buyers to oil leaks and cracked exhaust headers, particularly on the left side. Ask whether the valve springs, timing chain and oil-cooler lines have been serviced, and whether the turbocharger has been rebuilt or replaced. Invoices with dates and mileage carry more weight than a verbal list.
Read stored codes before the test drive
These cars use an ALDL connector under the dash below the radio. A compatible scan tool can show stored codes plus live data such as coolant temperature and oxygen sensor output. Have your inspector record what was stored before anyone clears it, because a freshly cleared memory hides history.
Treat modifications as a separate purchase
Hemmings describes engine modifications from mild to wild as very common. A properly modified car can make sense if you planned upgrades anyway, but reliability buyers should look for a stock or nearly stock car with records. Ask for a written list of changes to boost, fuel, chip and transmission.
Drive the 200-4R and test the brakes
The TH-200-4R uses a throttle-valve cable, and a misadjusted or broken cable can cause erratic shifting and eventual damage. Shudder or slip under light cruise can point to the lockup converter. The Powermaster electric-hydraulic booster was recalled for valve, switch and accumulator troubles, so ask whether it is original, rebuilt or converted to vacuum.
Look for rust in the usual G-body places
Inspect rockers, floor pans, rear wheel arches, lower quarters, door corners and door bottoms. Lower A-pillar rust is a labor-heavy repair, and drip-rail rust on the roof is common. On T-top cars, check anywhere the removable panels could have leaked water into the cabin.
Book the Grand National inspection with a shop that has seen the model before, and ask for a written report with photographs from underneath. Agree in advance who pays for the visit and what happens to your deposit if the findings are serious.
Use the history report for the right questions
Read title brands, dated odometer entries and changes of registration state before looking at service entries. Compare those events with the seller file and ask about gaps; a Grand National that sat for decades can show long silences that are normal, while a sudden mileage drop is not. The federal NMVTIS program explains its title, salvage and junk data role; it does not replace a workshop inspection. Our odometer discrepancy guide helps you separate a recorded conflict from proof of a particular fault.
Keep ownership paperwork separate from condition
Match the seller name to the title and request a written lien release where needed. Our lien-release checks explains the paperwork sequence. Federal odometer disclosure rules are summarized at Cornell LII, though older vehicles can be exempt from some disclosure requirements, so the absence of a mileage statement is not proof of anything by itself. Our service-record explainer covers what a missing service entry can and cannot tell you.
Set the offer after the inspection
Ask for separate estimates for safety work, overdue servicing and cosmetic improvements. A hypothetical $1,500 repair reserve is only a planning example; it can be inadequate on an older collector vehicle. A seller PDF can be edited, so obtain your own report using the identifier stamped on the vehicle. A seller who will not allow a scan, a cold start or a lift inspection has made the decision for you.
We are a licensed CARFAX and AutoCheck reseller, not affiliated with CARFAX, AutoCheck or Experian. Recent advertised pricing has been about $5.50 guest, $4.50 member or $6.75 for a bundle; confirm the price and included reports at checkout. Buy the report before committing, then keep it with the inspection findings and signed sale documents.
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