A used Triumph Stag is a good buy when the original 3.0-liter V8 has a documented cooling and head gasket history, or when the price honestly reflects an engine swap. Triumph built the Stag from 1970 to 1977, and the Wikipedia Stag page covers the history, including its short run in the U.S. market. On Nov. 5, 2026, the NHTSA recall API returned zero campaigns for a 1973 Triumph Stag query.
The V8 is the whole story
The Stag V8 built its reputation on overheating, warped heads and stretched timing chains. Many owners have sorted it with a better radiator, a fresh water pump and new chains, and a sorted engine is reliable enough to enjoy. Ask for receipts for that work, and watch the temperature gauge on a long drive in traffic. Milky oil, a sweet coolant smell or white smoke at start-up points to a head gasket problem.
Engine swaps and what they do to value
Plenty of Stags now run a different V8 or a Triumph six. Some buyers like the swap, while others pay more for a car with its original engine. Neither is wrong, but you should know which you are buying. Check the engine number against the paperwork and price a swapped car below an original one. Our Triumph recall check guide covers how to run the VIN.
Rust, hardtop and soft top
Check the sills, floors, wheel arches and the lower edges of the doors for rust and filler. The Stag has a T-bar roll hoop and many cars came with a hardtop, so ask whether both tops come with the car and test the soft top for tears and fit. A missing hardtop is costly to replace.
Gearbox, brakes and steering
Stags came with manual and automatic gearboxes, and manual cars may have overdrive. Test overdrive engagement on the road, look for leaks from the power steering, and check the brakes for a straight stop.
Paperwork and specialist checks
A Stag with a thick folder of cooling, chain and gasket receipts is worth more than a shinier car without one. Ask for the folder before you travel, and ask who did the work. A marque specialist can spot a tired V8 or a poor swap faster than a general shop. Book an inspection if the seller is far away, and ask for a cold start on video so you can hear the chains and watch for smoke before the engine warms. Our inspection cost guide covers what that usually runs.
When to walk away
- A V8 that overheats on the test drive.
- Milky oil or a coolant smell in the cabin.
- Heavy rust in the sills or floors.
- No title, or a title number that does not match the car.
Questions to ask the seller
- When were the timing chains and head gaskets last done?
- Is this the original engine?
- Does the hardtop come with the car?
- Has the title ever been branded or replaced?
Reading the history on a decades-old car
Do not expect a long service log. Records from the 1970s and 1980s were often never reported, so the report matters most for title brands, odometer readings at title transfers and registration gaps by state. A car that moved from a coastal or rust-belt state to a dry one may have been retitled; look at the dates and ask why. An approved NMVTIS check adds salvage and junk records from insurers and recyclers. If the odometer readings go backward or the car shows as exempt, ask for the paper trail before you price it. Our odometer discrepancy guide explains what those entries mean.
Private-sale paperwork
Most cars like this sell privately. Make sure the name on the title matches the seller ID, the VIN on the title matches the plate and the stamping on the car, and any old lien is released in writing. Our lien release guide walks through that step. Pay by a traceable method, get a dated bill of sale, and do not accept an open title signed by someone who is not present.
How to price it
Sorted original-engine cars, swapped cars and projects sell in different bands. Compare recent sales on Hagerty, and price in cooling work if there are no receipts.
What the report costs
As of early November 2026 a CARFAX bought direct usually costs around $44.99, and AutoCheck sits a little lower. We are a licensed CARFAX and AutoCheck reseller, not affiliated with CARFAX, AutoCheck or Experian. Our guest price has been about $5.50 a report, about $4.50 for members, and about $6.75 for a CARFAX and AutoCheck bundle. Confirm the price at checkout, since it can change.
On a car this old, read the report for title brands and odometer readings first; service entries are often thin.
Sources
- NHTSA recall lookup (API checked Nov. 5, 2026; zero campaigns returned for a 1973 Triumph Stag query)
- Triumph Stag, Wikipedia
- NMVTIS
- Hagerty (valuation tools)
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