Triumph Stag Buyer's Guide
Eight tracked Stag sales, £8,700 to £21,094, median £12,616: remarkably consistent numbers for a car that spent its first forty years as a punchline. The market has worked out what the owners' club always knew, that the Stag's infamous problems were maintenance problems, and maintained cars are simply excellent grand tourers with a V8 soundtrack nothing else British offers at the money.
Know your versions
One generation (1970–77), so the distinctions are specification and provenance. Mk1 and Mk2 differ in detail trim and gearing; the market cares more about three other things: the original Triumph 3.0 V8 versus period engine transplants (Rover V8 and Ford conversions were common when Stag engines were feared), manual-with-overdrive versus automatic, and the completeness of the hardtop-plus-softtop set. Original-engine manual cars with both roofs lead every sale.
What to pay
£8,000 to £11,000 buys usable automatics and cars with conversion history. £12,000 to £15,000, around our median, buys honest original-engine cars with the documentation that matters. £17,000 to £21,000, our top band, buys the best: original, manual, history-heavy and correct. Rough projects trade below our range and consume the difference in restoration.
What goes wrong
The V8's reputation rests on two period realities: timing chains that stretched when service intervals were ignored, and cooling systems (alloy heads, iron block, marginal radiators) that punished neglect with warped heads. Both are fully solved by modern maintenance: documented chain replacement and a properly maintained or uprated cooling system remove most of the model's risk, which is why the history file is the purchase. Beyond the engine: body rot in sills, rear arches, valances and the B-posts that carry the roll bar, all repairable with good parts supply through the club network and specialists.
Our view
Buy an original-engine Stag with cooling and chain invoices at our median and you own one of the most complete British classics: four seats, a V8 burble, genuine touring ability and a devoted support network. The conversion cars are honest transport at a discount but the original engine is where the value and the point both live. The reputation discount is still in the price; it will not stay there indefinitely.
