- Mk I
- July 1959 – April 1961. BN7 two-seater, 2,825 built · BT7 2+2, 10,825 built. Twin SU HD6 1.75in, 124bhp @ 4600rpm.
- Mk II
- May 1961 – 1962. BN7 two-seater, only 355 built · BT7 2+2, 5,096. Three SU HS4 1.5in, 132bhp @ 4750rpm — troublesome to keep in tune, and rare.
- Mk II convertible
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BJ7, 1962–64, 6,113 built. Back to two SU HS6 1.75in, 131bhp. Wrap-around windscreen, wind-up side windows, swivelling quarter lights, quick-action folding roof. Permanently replaced the two-seat BN7.
- Mk III
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BJ8, 1963/64 – December 1967, around 17,000 built (sources differ by about 1,400). Twin SU HD8 2in, 148–150bhp @ 5250rpm. Walnut fascia, centre console, Ambla upholstery, servo brakes standard.
- Body codes
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BN = two-seater · BT = 2+2 · BJ = convertible. BN7 and BT7 exist in both Mk I and Mk II. BJ8 is the only Mk III code.
- Brakes
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Front discs from launch, 1 July 1959, and rear drums on every 3000 ever built. Servo standard from the BJ8. Disc diameter is given as 11in by one source and 11.25in by another — measure before ordering.
- Phase 1 vs Phase 2 BJ8
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Phase 2 from May 1964, chassis 26705. Revised rear chassis frame rails for axle clearance · seven-leaf rear springs replaced by softer six-leaf · Panhard rod deleted, radius arms fitted · tucked-away exhaust. About 1,360 Phase 1 cars. Split every rear-end order at 26705.
- Engine
- 2,912cc BMC C-series overhead-valve six, carried over from the 100-Six and enlarged.
- Export
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91.5 per cent of 3000s were exported, mostly to North America. Many New Zealand cars are ex-US left-hand-drive imports — establish which before ordering anything handed.
- Why it ended
- Production stopped in December 1967 because the car could not be made to meet the coming US safety and emissions rules, and North America was almost the whole market.