The 101-series Giulia Spider is a beautiful, genuinely usable classic — front discs, a five-speed gearbox and that jewel of a twin-cam — but it is a sixty-year-old Italian monocoque, and buying well means looking past the paint. Rust is the first, second and third thing to check; the mechanicals are robust if they've been maintained.
Rust — the big one
There is essentially no such thing as a rust-free 750/101 Spider: survivors either are rusty, or have been rusty and repaired — and the quality of that repair is what separates a good car from a money pit. Check the sills and their jacking points (a collapsing jack point is the classic tell), the floor pans and boot floor (lift the carpets — damp or flakes of rust mean trouble below), the battery tray, the bottoms of the wings and the tops of the front wings where mud collects, the lower insides of the doors (bubbling is the first sign), and around the window trim. Inconsistent panel gaps and doors that don't line up can betray past structural rust or repair. Soggy carpets point to floor rust and a leaking or ill-fitting hood.
Engine & cooling
The 1,570 cc all-alloy twin-cam is strong, but its cooling system is the weak spot. Neglected coolant — no corrosion inhibitor — erodes and weakens the alloy castings and silts up the radiator, a combination that causes overheating and blown head gaskets. The proper cure is a recore or new radiator and, where needed, skilled welding to rebuild the castings; a head skim alone is not enough. Check the oil and coolant condition, look for leaks, and watch for smoke — under hard acceleration points to bores or rings, on the overrun to valve guides. Drive it hard, then leave it idling: it should not boil. Confirm the engine is the correct spec and ideally matching-numbers, as 101 and 105 parts interchange freely and a "101" car can hide later components.
Carburettors
The Normale runs a single carburettor, the Veloce twin Webers. Expect to fettle and balance them; a lumpy idle is often just tuning rather than anything serious.
Gearbox & drivetrain
The Alfa five-speed is a strong box, but second-gear synchro wear is its classic weak point — feel for a crunch on a quick shift into second. Check the clutch, and listen for differential whine.
Brakes
Front discs — a real advance over the drum-braked early Giuliettas. Check the car stops straight and that discs and cylinders are sound.
Electrics
Italian wiring has a reputation, but the Spider doesn't suffer too poorly — check the basics work (lights, indicators, starter) and that the earths are sound.
Trim & parts
Mechanical parts are available but not the cheapest; original trim is expensive to source and to re-trim, so factor the interior's condition into what you pay.
Identity & value
Check the chassis and engine numbers against the type: Normale 101.23 (LHD) / 101.19 (RHD), Veloce 101.18. A Veloce commands a premium over a Normale; right-hand-drive cars are rarer than left; matching numbers and documented history add real value.
Normale or Veloce?
The Veloce is faster, rarer and more valuable (twin Webers, the bonnet scoop); the Normale is more docile, more usable and easier to buy. Neither is "wrong" — it depends whether you want the sharper car or the easier one.
A general guide — have any car you're serious about inspected by a marque specialist, and confirm figures and originality against the appropriate references and the Alfa Romeo Owners' Club.