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Triumph Stag: Buying guide and review (1970-1977)

Triumph Stag: Buying guide and review (1970-1977) Classic and Performance Car
Triumph Stag Triumph Stag Triumph Stag
The Triumph Stag should have been a world-beater. After all, with its sharp Michelotti-penned lines, four-seater convertible configuration and V8 power, how could it fail? Here was a car that could transport the whole family – with their luggage – in top-down style. It sounded glorious and there was no shortage of go either, thanks to that torquey 3.0-litre powerplant. 
But as we all know, the Stag did fail, thanks to an array of build-quality issues and indifferent dealers who couldn’t fix the litany of problems that invariably cropped up when the Stag was still in its warranty period. Part of the problem was the fact quality control during production of the various components was seriously lacking. The V8 engine was also seriously underdeveloped, and failure rated in the early days was horrendous. 
Thankfully, things have moved on since then. Most Stags have been restored so they’re screwed together with far more care than they were the first time round. Lots of the issues that were engineered in have now been engineered out, to the point where there’s no reason to fear unreliability. Indeed, buy a restored Stag that’s had a few sympathetic upgrades and you’ll find it’s one of the most usable, affordable and enjoyable classics around. 
Which one to buy? 
All Stags are essentially the same in terms of specification; the only thing that separates them is whether they’ve got a manual or automatic transmission. Which one you go for is a matter of preference, but it’s generally the manual/overdrive cars that the market favours, although autos are more common. However, a modern four-speed automatic gearbox is a sought-after upgrade. 
There’s never any shortage of Stags for sale, but (predictably) the good ones are far outnumbered by average or downright shoddy examples. So you have to buy really carefully as many Stags aren’t as good as their owners think. The key is to find a car that’s been properly restored by someone who knows what they’re doing, and it’ll also have had some sympathetic modifications to improve usability and reliability. 
The sorts of improvements you’re looking for include an engine that’s been rebuilt and fully balanced, an electric fan (to go with an overhauled cooling system) plus electronic ignition. Re-valved steering for improved feel, ventilated discs up front and Datsun driveshafts in place of the splined originals are also worth seeking out. 
What you really don’t want to buy is a Stag with an engine other than the original 3.0-litre V8 – converting from a Triumph straight-six, Ford V6 or Rover V8 will cost plenty and there are lots of Stags with an original powerplant, so there’s no reason for buying anything else. 
There were a few unusual special-build Stags, of which very few remain. Three prototype Fastback Stags were produced, and although two of these were destroyed. That leaves one genuine fastback survivor, although you might find various home-built efforts around. Triumph also experimented with four-wheel drive, building three examples. Utilising a GKN-FF transmission, a very similar set-up the Jensen FF, the only visual clue is a bonnet bulge to accommodate the raised engine block.
Performance and spec 
Engine 2997cc, V8
Power 145bhp @ 5500rpm
Torque 170lb ft @ 3500rpm
Top speed 117mph
0-60mph 10.5sec
Fuel consumption 22mpg
Gearbox Four-speed manual + overdrive (three-speed auto optional)
Dimensions and weight
Wheelbase 2540mm
Length 4413mm
Width 1613
Height 1257
Kerb weight 1275 kg
Common Problems
• Expect corrosion in the sills, floorpans, wings and also the seams between the inner and outer wheelarches, unless the car has been restored. The welded-on wings have to be removed to properly repair the sills. Other corrosion hot spots include the bases of the A-posts and B-posts, the door bottoms, the outriggers and the leading edge of the rear wings. Most body panels are available off the shelf.
• Also keep your magnet handy to check the front and rear valances, the seams between the front wings and the front panel, the trailing edge of the boot lid, the boot floor, the petrol tank and all over the hard top, as it contains numerous rust traps. 
• Try to get a good look below the battery if possible, as rust often forms on the tray due to trapped water. Access is tight, and although replacing the battery is not a huge job, a recent replacement is a bonus. 
• Despite its poor reputation, the Stag’s V8 is perfectly reliable if it’s rebuilt and maintained properly. Most problems centre on the cooling system, so get the engine up to temperature and give it a thorough test drive. The waterways and radiator can get blocked up with debris if anti-freeze levels aren’t maintained, and also ensure the Torquatrol viscous-coupled engine fan works. 
• Worn cam followers (and their bores) can also be an issue, given away by tapping noises at idle. However, valve clearances that haven’t been set properly can also give the same symptoms; setting these properly is fiddly, so it’s sometimes allowed to slide. 
• Gearboxes – manual and auto – are reliable and will go for 120,000 miles between rebuilds. Worn synchromesh on second gear is the first sign of trouble on the manual gearbox, but rebuilt units are easy enough to source. 
• What’s harder to find is a decent clutch, so check that what’s fitted isn’t on its way out. If there’s chattering from behind the engine, which disappears when the clutch is dipped, the thrust bearing has worn. If the clutch is really stiff it’s probably because the engine and gearbox are running out of line with each other as there are no locating dowels. Modified clutch plates are available, to deal with this. 
• All Stags have power steering, so check for leaks. Vague steering is probably down to worn bushes in the suspension and steering rack. Particularly twitchy handling points to worn trailing arm bushes, but replacing these is easy. 
• Twitchiness through bends betrays binding telescopic splined joints in the drive shafts. Cleaning these and applying some CV joint grease should fix things. 
• The electrical system is generally reliable, although the fuel pump can stick, which prevents the engine starting. If the engine turns over but won’t fire, listen for the fuel pump whirring in the offside corner of the boot.
• Interiors are generally very hard wearing, and the vinyl seat covers are extremely durable. The foam seat cushions however do collapse with age, which will result in foam ‘crumbs’ appearing on the carpet. Thankfully, replacements can be bought, or even made. 
• Check the overall condition of the dashboard too, as the wood veneer often cracks, although this can generally be re-finished by a specialist. 
Model history 
June 1970: Stag is announced with 2997cc V8 engine and manual or automatic transmissions. 
July 1971: Stag introduced to the USA. 
October 1972: Overdrive now standard for all manual cars. 
February 1973: Stag MkII introduced with matt black tail panel and sills, plus new instruments. Wheel trims are now all silver, a hard top is standard and the rear quarter windows are deleted from the hood. 
April 1973: Alloy wheels replace wire wheels on the options list. 
July 1973: Stag withdrawn from USA. 
January 1974: Hazard and seat belt warning lights now fitted. 
March 1975: Optional air-conditioning no longer available. 
October 1975: Alloy wheels, tinted glass and laminated windscreen now standard. 
October 1976: Stronger Borg-Warner Type 65 automatic gearbox replaces previously fitted Type 35 unit. 
June 1977: Last car is built, after a production run of 25,939 units. 
Owners clubs, forums and websites
• www.stag.org.uk 
• www.brmmbrmm.com/trstagenth 
• www.tristagreg.org 
• www.club.triumph.org.uk 
• www.tssc.org.uk 
Summary and prices
As a stylish V8-powered cruiser, the Stag is about as good as it gets. Find a nice example to begin with, and add improvements over the winter months, and enjoy in all weathers without fear of breakdowns. The very best Stags will command over £13,000, however anything over £10,000 should be pretty well sorted. Restoration projects can still be had for around the £2000 mark, while a slightly rough runner will probably cost around £5000.
Words: Richard Dredge
Triumph Stag Triumph Stag Triumph Stag
Last updated: 20th Jan 2016
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Triumph Stag cars for sale

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Triumph Stag
7950 23995 GBP
  • 1975 Triumph Stag Automatic

    £19,995 £19,995

    This outstanding low mileage Triumph Stag was supplied new by Paul Street Garage Ltd, London EC2 and supplied new to National Car Parks Limited in West London. This French Blue example spent six years in Northern Ireland before first coming to us in 2014 with a mileage of 60,000 from new. Since selling the Stag in 2014 to one of the key board members of the East Yorkshire Thoroughbred Car Club, the car has covered 4000 miles and has had almost £5000 taking the car to a truly outstanding standard. Work includes fully re-furnishing the original hard top, major engine bay detailing, annual servicing and mechanical maintenance. The Stag has now come back to us in part exchange and has to be of one the smartest, most genuine automatic Stags we have owned. This is a truly superb motor car and it will not disappoint. The car comes with its original handbook, Passport to Service book with stamped PDI, sales brochure, British Leyland warranty card and original stereo manual and wiring diagram. The car has arrived with us in exceptional order and has the most superb, straight, rust free bodyshell. The underside is outstanding, the engine bay excellent and the individual panels are all in fir

    • Year: 1975
    • Mileage: 4000 mi
    For sale
    Classic and Sportscar Centre
  • 1973 Triumph Stag


    1973 Triumph Stag Mk2 VIN: LE21675U This Triumph Stag is a documented one-owner example, purchased new by Byron Webb as his personal car when his dealership, Webb Motors in Roanoke, VA, was a factory authorized Triumph dealer. Originally used for touring early on, and in recent years exercised only on Sunday morning drives to church, the 40,747 miles is original and correct. The Stag has spent its entire life in Mr. Webb's climate controlled garage, or on proud display in his dealership's showroom. Maintained since new by Mr. Webb's factory trained mechanics, it presents in stunning condition. Having received meticulous, almost fanatical care and maintenance throughout its life, Mr. Webb's only changes from the original specifications were non-invasive upgrades that included a dual oil and temperature gauge in place of the original temperature gauge, a Crane XR-7000 electronic ignition, and a Rimmer Brothers radiator. Such low mileage cars, no matter how well cared for, always need a good bit of fettling to get them back up to reliable road going spec. When we acquired this car an extensive diagnostic was performed, and all the outstanding issues have been resolved. Some of the maj

    • Year: 1973
    For sale
  • TRIUMPH STAG 3.0 1975

    £10,500 £10,500

    Triumph Stag which has the original engine. The previous owner had the heads reconditioned and a full re-spray. The car then went into storage for around ten years. ;;This lovely Stag is currently gone recommissioning process in our workshop, so far we have fitted recondioned wheels, checked the brakes, etc. We then sent the car to a local Stag specialst upholster who fitted a reconditioned hood frame, a new bespoke hood (far better fit then rimmer type ones) and he has fitted new bolsters to the from seats and generally given the trim a new sense of life. The retail value of this was GBP 1850.;;We have changed the fulides, full service, new belts, 12 Months MOT and a general full check over. ;;Nuneaton Car Sales showroom in Hinckley is open 7 days a week, see www.nuneatoncarsales.co.uk for more images. Or call 01455 631113 to make an appointment.

    • Mileage: 94121 mi
    • Engine size: 2.997
    For sale
  • TRIUMPH STAG Mark 1 Manual Over Drive 1970

    £15,500 £15,500

    This a fantasic opportunity to own a rare piece of Triumph Stag history, this is a very early vehicle, one of the oldest stags on the road and 32nd off the production line, verified by stag owners club and the chassis number, Triumph V8 with manual over drive, gleaming yellow bright work with saddle tan interior, electronic ignition, kenlow fan, hard top, three window soft top, bumpers re-chromed, tax exempt, huge history file, lots spent (receipts totaling GBP 13,000 since 1983) well maintained, full Rimmer Bros full engine at 82,000 miles, dry stored ,MOT unit August 2017, Very good condition throughout drives superbly, good investment which will only continue to rise in value. Photod with the correct original wheels, in the last piture there is a set of refurbished Stag alloys which we will happily fit for you should you desire. Any inspection welcome. Our showroom in Hinckley is open 7 days a week. Lots more photos at www.nuneatoncarsales.co.uk

    • Mileage: 126000 mi
    For sale
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