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it's just an A+ 1275 - no real difference to any other 1275

The MG Metro benefitted over the Austin version by having a modified camshaft, bigger valves, exhaust extractors and a compression ratio of 10.5:1 (up from 9.4:1). Apart from the fact it had a single HIF44 SU carburettor, the engine had effectively been "Cooperised", to produce 72bhp - the Mini Cooper S had produced 75bhp with twin carbs and 9.7:1 compression.

the one outstanding version is the MG Metro engine. Where the majority of the variously similar power plants put out around 63-65bhp, the MG metro achieves a more spirited 70-74bhp. This is due to a higher compression ratio (10 -1), larger inlet valve (35.7mm instead of 33.3mm), and - mainly - a more sporty camshaft with half-decent induction and exhaust systems. The inlet manifold being a reasonably good flowing, water heated aluminium example. Rover finally got the hint having witnessed the prolific after-market fitment or such an item to Minis in epic proportions for years. The exhaust manifold is a cast iron 'LCB' style with a pair of exhaust downpipes instead of the more common single item and works very efficiently. A bonus of this over the more common after-market steel-tubed LCBs is that it is much quieter by dint of absorbing more exhaust 'noise'. Coupled to a pair of Maniflow tubular steel downpipes it is very nearly as efficient as a full tubular steel manifold. The cylinder head is more along the lines of the old Cooper S spec and in fact flows slightly more air than it's predecessor, the camshaft being the sportiest fitted to any production A-series engine. It uses the inlet profile and timing of the original 997 Cooper cam and the exhaust specification of the old Leyland Special Tuning '731' fast road cam.