- Engine (1500)
- 1,489cc BMC B-series pushrod OHV four-cylinder — 68 bhp / 69 PS at 5,500 rpm (source: MG Car Club MGA Register model profile PDF, fetched 6 July 2026: 'Maximum BHP 68 at 5500 rpm')
- Engine (Twin Cam)
- 1,588cc DOHC twin-cam four-cylinder — approximately 108 bhp / 110 PS at 6,700 rpm quoted historically; Verify per specific chassis against BMIHT record and factory rating
- Engine (1600)
- 1,588cc BMC B-series pushrod OHV four-cylinder — approximately 79 bhp / 80 PS quoted historically; Verify per specific chassis
- Engine (1600 Mk II)
- 1,622cc BMC B-series pushrod OHV four-cylinder — 86 bhp / 87 PS with twin SU carburettors (source: RM Sotheby's Gene Ponder 2022 Lot 3176 catalogue, fetched 6 July 2026, verbatim: '86 hp, 1,622-cc four-cylinder engine with twin SU carbs and aluminum valve cover')
- Transmission
- Four-speed manual (non-synchro first on 1500; synchro first from later production). Some restored / competition cars fitted with modern five-speed conversions (e.g. Tremec, as fitted to the BaT Lot #238,430 Twin Cam) — treat as a value-neutral / negative factor for a strict-originality collector, value-positive for a touring / rally car.
- Suspension
- Independent front (coil-and-wishbone with lever-arm dampers); live rear axle on semi-elliptic leaf springs with lever-arm dampers. Bring a Trailer 1959 Twin Cam Lot #238,430 (fetched 6 July 2026) verbatim: 'independent front suspension with coil springs and hydraulic dampers as well as a rack-and-pinion steering system'.
- Brakes
- Drums all round on 1500; front discs on 1600 and Mk II; four-wheel Dunlop discs on Twin Cam and Mk II Deluxe.
- Body
- Steel body over separate ladder chassis; Roadster (removable side curtains, detachable hood) or Fixed-Head Coupe (proper fixed roof with wind-up windows).
- Production window
- 1955 – July 1962, at Abingdon, England (source: Wikipedia, fetched 6 July 2026: 'by the end of production in July 1962')
- Production — total
- ~101,081 units per MG Car Club MGA Register 'Production Figures Summary' (mgcc.co.uk, fetched 6 July 2026); ~101,476 units per Wikipedia (fetched 6 July 2026, verbatim: 'A total of 101,476 units were marketed by the end of production in July 1962'). Treat the ~400-unit discrepancy as Verify and cross-check against the individual chassis's BMIHT Certificate.
- Production — home market
- 5,869 UK home-market cars (source: Wikipedia, fetched 6 July 2026, verbatim: '5869 cars were sold on the home market, and the MGA was replaced by the MGB'). The vast majority of production was exported, predominantly to North America.
- Chassis prefixes
- HD (1500), YD Roadster / YM Coupe (Twin Cam), GHN / GHD (1600), GHNL / GHDL (1600 Mk II, left-hand drive). RM Sotheby's Hershey 2018 Lot 223 chassis GHNL2/106350 and Gene Ponder 2022 Lot 3176 chassis GHNL2/108480 are both left-hand-drive Mk II US-export cars (both catalogue pages fetched 6 July 2026).