Morgan announced the introduction of the Plus 4 Super Sports using a specially tuned Triumph TR engine developing 116 b.h.p at 5500 r.p.m. giving the car a maximum speed of 115-118 m.p.h. Complete with a gas flowed head with 9.0 to 1 compression ratio, a special camshaft, fully balanced crankshaft assembly, rods and pistons. Two double-choke Weber 42DCOE carburettors and a special inlet manifold feed breathing through a four-branch dual pipe exhaust system. The price was £1314 including purchase tax.
The 4/4 Series 3 was replaced by the Series 4 fitted with the more powerful Ford 109E engine of 1340 c.c. from the Consul Classic.