1971 ALFA ROMEO GTV

Typical onset: 60,000-120,000 mi

Symptoms: metallic knocking at idle that worsens with RPM, oil pressure drops below 20 psi hot, metal shavings in oil filter, sudden catastrophic engine seizure if ignored

Fix: The twin-cam runs marginal oil pressure by design and the original pump struggles after decades. Spun bearings require full engine-out teardown, crank inspection/possible regrind, new bearings, and typically rings/pistons while you're in there. 40-60 hours labor for proper engine rebuild with machine work.

Estimated cost: $4,500-8,000

Typical onset: all mileages—age-related

Symptoms: excessive shifter vibration and slop, grinding synchros in 2nd gear especially, difficult engagement when cold, clunking on acceleration/deceleration

Fix: The rubber transmission mount deteriorates over decades causing misalignment that accelerates synchro wear. Mount replacement is 2-3 hours, but if synchros are gone you're looking at a full gearbox rebuild requiring removal (8-10 hours) plus internal work. Second gear synchro is weakest link.

Estimated cost: $200-400 for mount alone, $2,500-4,000 for full rebuild

Symptoms: rough idle and stumbling, black smoke or extremely rich running, flat spots during acceleration, hard starting when hot, fuel leaks from deteriorated lines

Fix: Dual Weber 40 DCOE sidedrafts are glorious but finicky—rubber components rot, jets clog, and finding someone who can properly tune them is half the battle. Budget 4-6 hours for carb rebuild plus another 2-3 for proper synchronization and jetting. Fuel filter clogs constantly with tank sediment.

Estimated cost: $800-1,500

Typical onset: 100,000+ mi

Symptoms: deep rumbling knock distinct from valve train, oil pressure never reaches spec even cold, excessive crankshaft end play, vibration through entire rev range

Fix: High-revving twin-cam design is hard on the bottom end. Crank journals wear oval, main caps can walk. Requires complete engine removal, crank R&R, measuring for regrind (.010, .020, or .030 under), line boring if needed. Plan on 50-70 hours all-in with machine shop turnaround.

Estimated cost: $5,000-9,000

Typical onset: 80,000-140,000 mi

Symptoms: blue smoke on startup that clears, smoke under hard acceleration, oil consumption exceeding 1 qt per 500 miles, loss of compression—below 140 psi

Fix: Soft factory cylinder walls wear into taper, rings lose tension after decades. Proper fix requires bore measurement, honing or overbore (.020 typical), new pistons/rings, head work while off. Short block replacement is 35-45 hours; full rebuild adds another 10-15 for head reconditioning.

Estimated cost: $3,500-6,500

Typical onset: 70,000-100,000 mi

Symptoms: rattling from front of engine especially cold, erratic timing/misfires, cam position suddenly jumps (bent valves if chain skips)

Fix: The duplex chain stretches and the hydraulic tensioner wears—when it lets go you're looking at valve-to-piston contact. Replacement requires front cover removal, timing reset on both cams. 8-12 hours if caught early; add valve job if you jumped time. Should be done preventively at 60k.

Estimated cost: $1,200-2,000 preventive, $3,000-5,000 with valve damage