1972 AC 428 Frua Fastback - The Ultimate Project Car?! For Sale

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  • £110,000 As stated
  • 1972
  • Wallingford
Message the seller
Price £110,000 As stated
Ad Type For Sale
Category Classic Cars
Make AC
Model 428 Frua Fastback
Year 1972
Mileage 37,767 miles
Country UK
Region Oxfordshire
Town Wallingford
Telephone 07506 526075
Status Trade
Date 26-Dec-2020
Ref C1271978
Born on the back of the Cobra two-seat roadsters, AC decided to move up-market and build a larger and altogether more civilized car. They had a fantastic and proven race-bred chassis in the Mk III Shelby Cobra, and their close relationship with both Shelby and Ford ensured an adequate supply of engine and running gear.

The original AC Company had been making sporting cars for more than 20 years, but in 1930 was forced into liquidation. The Hurlock brothers, William and Charles, purchased the AC factory and assets to obtain more depot space for their successful haulage business. As they also serviced cars and trucks, they kept the AC service department running. The sporting owners of AC cars kept asking when they could expect a new model, and seeing an opportunity to clear the parts bin from the liquidation, the Hurlocks built cars on demand. They were fortunate to source a chassis from Standard that was supposed to be exclusive to William Lyons at SS, and on this they produced a lightweight aluminum open tourer that paved the way to further sporting and sales successes.

Derek Hurlock, who now oversaw the family AC concern, eyed the success of the emerging market for fast sports GT cars and thought AC had the platform to build such a car using the simple-to-maintain Ford power plants. The Mk III Cobra chassis was lengthened by six inches and sent to Italian coachbuilder Frua, who designed an attractive fastback coupe and trim for the new car.

“The 428 fits my image of a true GT car — like anything exclusive, especially hand-built from craftsmen, it costs a lot of money,” Hurlock said. The AC 428 is the only production GT car that offered fully adjustable independent front and rear suspension, a valuable legacy of the Shelby racing heritage. Make no mistake, this is a seriously fast car that lopes from 0–60 mph in six seconds, has a top speed of over 140 mph and is capable of cruising all day at 130 mph if required. An exclusive club indeed!

Thinking back to the early 70’s when this car was built, the competition were offering similar style ‘fastbacks’ such as the Ferrari Daytona, Lamborghini Miura, Iso Griffo and Maserati Ghibli. All of which today are incredibly rare, desirable and expensive collector cars. The AC Frua Fastback is by far the rarest of all of the above as there were only 52 cars ever built in fastback form, of which only around 44 cars are believed to still exist today. Compare that to the 1,284 Ferrari Daytona’s built and this AC Frua Fastback represents an incredible piece of history and for a fraction of the price of a Ferrari Daytona.

Ok, so the 428 doesn’t run a V12 engine but a Cobra 427 big block V8 is still able to offer just as much of a trill factor, especially this engine and this set up as offered today in Chassis CF69.

This particular car, chassis CF69 Fitted with a rare 1968 Ford Nascar side-oiler engine which were never built in large numbers. The side-oiler was selected as it could handle substantial modifications (hence the Nascar usage). Specificially this engine has a forged-steel cross-drilled crank stroked to displace 8.3 litres/482 cubic inches. Cross-bolted main bearing caps and screw in core plugs, solid tappets and aluminium Drove roller rockers, a high-lift camshaft, all fitted with ARP grade eight bolts, producing approximately 580lb.ft of torque. Seven quart Canton oil pan with trapdoors and windage tray, Valvoline semi-synthetic racing oil with aluminium oil catch tank. Remote oil filler with Goodrich stainless steel hoses with twin oil coolers.

Chassis CF69 is even more unique in having been optioned with aluminium doors, boot and bonnet skin which were fitted by AC at their Brooklands factory in the 70s.

Holley street Avenger 770 cfm carburettor with four barrel and vacuum secondaries enclosed in a custom aluminium cold box. Holley 110 gph fuel pump housed in the boot running at 7lbs psi with two filters. Aluminium performer rpm cylinder heads, aluminium period Cobra Le Mans rocker covers (included with the car) aluminium Street Master single-plane inlet manifold and aluminium high performance water pump, large custom aluminium radiator with two stage Kenlowe fan and Evans waterless coolant which boils at 180 degrees centigrade.

Custom made stainless steel headers with three inch exhausts. Edelbrock silencers which exit from the sides plus 2 removable reducers (included in the sale). Mallory electronic Unilite distributer and Pro master coil. Blue Max eight millimetre spiral-core high-temperature high-voltage HD leads. Twin circuit servos with twin master cylinders separating the front and rear brakes with Automec silicone brake fluid which has a high boiling point of 260 degrees centigrade. APS silicone hoses and a lightweight Powermaster XS high torque starter motor is installed making this a reliable mechanical set up to this monstrous big-block V8 fastback.

The engine was built by the guru of American Ford V8’s, Stuart Mathieson of Mathwall engineering established in the 1960’s. Stuart started as an apprentice at Aston Martin producing Roy Salvadori and Carroll Shelby’s DBR1 Le Mans winning car. He then moved to Alan Mann racing and in 1959 he worked on the Daytona Cobras building their engines, eventually clinching the World Sports Car Championship at Reims. Stuart then built the engines for the GT40 project driven by Jackie Steward and Graham Hill. All of his engines are dyno tested on his famous dynometer of Dan Gurney’s All American Racing heritage.

The gearbox runs a Ford C6 transmission which has been upgraded to full manual twin clutches, rebuilt B&M Holeshot torque converter with 2800 stall speed, cast aluminium extra two quart oil pan with TCI Max Shift transmission fluid remote oil cooler with braided hoses. Manual action B&M Pro stick shifter meeting NHRA and IHRA requirements with reverse lockout. The gearbox was upgraded and rebuilt by Alders of Hailsham Sussex in 2015.

Fitted with a full roll cage and FIA approved Cobra bucket seats and fire extinguishers this car is ready to be competed at hill-climb or sprint events. The tyres currently fitted to the car are Michelin Pilot Sports. The owner has competed this car for the past 30 years at AC owners club events and hill climbs across the UK.

This is a truly unique opportunity to acquire one of the very few remaining AC 428 Frua Fastbacks to either compete as it is or to revert back to period factory specification. Included in the sale are many of the car's original parts (see photos). The original engine was destroyed but an original, fully rebuilt engine can be included for an additional amount. This is a 427 engine of the same that was originally fitted. Here is a brief list of the parts included in the sale:

- Rear Bumpers (LH + RH) in need of refurbishment
- Alternator
- Rear Quarter Glass x 1 (the other was blown out and destroyed)
- Both rear quarter glass latches/catches.
- Both front quarter glasses including mechanisms
- Door cards (LH + RH) (good condition)
- Leather parcel shelf (good condition)
- Boot floor carpet section (LH + RH)
- Both LH and RH door window glass and electric winder mechanisms
- Radio aerial mechanism
- Flywheel
- 2 x Fuel filler caps with keys
- Internal switch gear (assorted)
- Original front grilles (LH & RH)
- Both LH and RH rear light units (good condition)
- Headlights x 2
- Fog lamp unit and reverse light unit
- fuel pump x 2 (original)
- Shock absorber
- Original filler cap door x 1 (Toni cannot find the other but if he does he will include it in the sale)
- Bumper mounts
- Rear windscreen (not pictured)
- Front windscreen (not pictured)
- Rear bumper (in need of refurbishment)
- Gear shifter unit and replacement handle (plastic) NOS
- Gear shifter surround

The car is ready for immediate inspection by appointment only, please contact Ben on the details above and find more photos at carvaultco.com.
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