- 1500
- May 1955, chassis 10101 – April 1959, chassis 68851. 1,489cc, 73.025 × 89mm. Lockheed drums all round, 10in front and rear, two leading shoes at the front. 58,750 built.
- 1600
- May 1959, from chassis 68851 – March 1961. 1,588cc, 75.41 × 89mm, 79.5bhp. 11in front discs, 10in rear drums. 31,501 built.
- 1600 Mk II
- March 1961, chassis 100352 – May 1962, chassis 109070. 1,622cc, 76.2 × 89mm, 90bhp. 4.100:1 rear axle and a revised head with larger valves. Recessed grille, Mini tail lamps below the deck lid. 8,719 built.
- The brake split
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Chassis 68851, May 1959. Below it, drums all round. At or above it, front discs. This one number settles every front brake order.
- Disc diameter
- Sources give 11in and 10.75in — and 10.75in is the MGB’s figure, which looks like a carry-across. Measure before ordering.
- Twin Cam
- April 1958 – May 1960, about 2,111 built. 1,588cc gear-driven DOHC alloy head, 9.9:1 then a low-compression 8.3:1, 108 then 100bhp. Dunlop discs on all four wheels with separate master cylinders. Dunlop peg-drive knock-off centre-lock steel wheels. Withdrawn after warranty trouble with detonation.
- De Luxe
- 1960–1962, 395 built — 70 roadsters and 12 coupes in 1600 form, 290 and 23 in Mk II form. A pushrod engine on Twin Cam chassis and running gear: four-wheel Dunlop discs and the knock-off wheels. A De Luxe brake or wheel part is a Twin Cam part.
- Coupe vs roadster
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Coupe only: wind-up door glass with a crank, opening quarter windows, exterior door handles, a taller more curved fixed windscreen in its own frame, and a large fixed rear window. Roadster: no exterior handles, removable sidescreens, no door glass. Doors are different shells. Glass, door seals, screen rubber and rear screen rubber are all coupe-specific.
- Electrics
- Originally positive earth. Many have been converted — check yours before ordering polarity-sensitive parts.
