Cosworth Early types Early types

| Type_ | Year_ | Block | Displacement | Mainly_For |
|---|---|---|---|---|
| Mk.I | 1959 | 105/107E | 997 cc | Development of A2 and A3 camshaft |
| Mk.II | 1960 | 105/107E | 997cc | Lotus Mk.VII |
| Mk.III | 1960 | 105/107E | 997cc | Formula Junior |
| Mk.IV | 1961 | 105/107E | 1098 cc | Formula Junior |
| Mk.V | 1962 | 109E | 1340 cc | Lotus Mk.VII |
| Mk.VI | 1962 | 109E | 1340 cc | Lotus Mk.VII |
| Mk.VII | 1962 | 109E | 1475 cc | 1.5 Litre class |
| Mk.VIII | 1963 | 116E | 1498 cc | Lotus Mk.VII |
| Mk.IX | 1963 | 116E | 1498 cc | 1.5 Litre class |
| Mk.X | 1963 | 116E | 1498 cc | Development of Mk.XII and XIII |
| Mk.XI | 1963 | 109E | 1098 cc | Formula Junior |
| Mk.XII | 1963 | 116E | 1594 cc | Lotus 20B , 22 , 23 |