[2] The car would face competition in the marketplace from the recently introduced Ford Anglia, Austin A30, and Morris Minor.

Other significant differences between the engines, including the number and placement of intake and exhaust ports and the ability of the SC to be expanded to nearly 1.5 L, make this unlikely.

By the time the Standard Pennant, a revised Ten with tail-fins and optional two-tone paint schemes, was launched in October 1957, output of the 948 cc engine had increased to 37 bhp (27.6 kW).

To gain the extra displacement the cylinders were placed out of centre which cleared the studs so that a bigger bore could be used.

[4] An upmarket version, the Herald 12/50, was offered from 1963 to 1967 and featured a tuned engine with a claimed output of 51 bhp (38.0 kW).

[7] A special light-alloy 8-port racing cylinder head used on the later Le Mans and Macau Spitfires' 1147 cc engines was labelled "70X".

When it debuted in the Triumph 1300 with a single Stromberg CD150 carburettor it developed 61 hp (45.5 kW) due to the adoption of the German DIN rating system; the actual output was the same for the early Mark IV.

The less powerful North American version still used a single Zenith Stromberg carburettor and an 8.5:1 compression ratio.

Displacement remained at 1296 cc, but in 1973 larger big-end bearings were fitted to rationalize production with the TR6 2.5 L engines, which somewhat dampened its previously high-revving nature.

Debuting in the front-wheel drive Triumph 1500 with a single SU carburettor, power output was 61 bhp (45.5 kW).

Later used in the Triumph Spitfire 1500, this final incarnation of the engine was rather rough and more prone to failure than the earlier models, although torque was greatly increased.

After adding a catalytic converter and exhaust gas recirculating system, the US market engine only delivered 53 bhp (39.5 kW).

Aided by a 9:1 compression ratio, less restrictive emissions control equipment, and two Type HS4 SU carburettors in place of the smaller Type HS2s, the Spitfire 1500 engine produced 71 hp (52.9 kW) at 5,500 rpm, and 82 lb⋅ft (111.2 N⋅m) of torque at 3,000 rpm.