Editing Cosworth (section)

===Early types===
The following is the list of initial products, with [[cylinder head]]s modified, but not originally designed by Cosworth, on [[Ford Kent engine]] [[cylinder block]]s. The exceptions were Mk.XVII and MAE (modified Anglia engine), which had intake port sleeves for downdraft carburettors brazed into the stock cast iron cylinder head, in place of the normal side draft ports, thus could be considered Cosworth designs.
{|class=wikitable
!designation!!year!![[Cylinder block|block]]!![[Engine displacement|displacement]]!!claimed [[Power (physics)|power]]!!description!!intended for
|-
| Mk.I || 1959 || 105/107E || 997 cc || – || Experimental one-off to test cam designs || Development of A2 and A3 camshaft
|-
| Mk.II || 1960 || 105/107E || 997 cc || 75&nbsp;bhp || First series production engine, A2 cam || [[Lotus Seven|Formula Junior]]
|-
| Mk.III || 1960 || 105/107E || 997 cc || 85–90&nbsp;bhp || A3 cam, optional dry sump || [[Formula Junior]]
|-
| Mk.IV || 1961 || 105/107E || 1,098 cc || 90–95&nbsp;bhp || Mk.III with larger bore. || [[Formula Junior]]
|-
| Mk.V || 1962 || 109E || 1,340 cc || 80&nbsp;bhp || Series production road engine || [[Lotus Seven]]
|-
| Mk.VI || 1962 || 109E || 1,340 cc || 105&nbsp;bhp || Racing version of Mk.V || [[Lotus Seven]]
|-
| Mk.VII || 1962 || 109E || 1,475 cc || 120&nbsp;bhp || Mk.VI with larger bore || 1.5 litre class
|-
| Mk.VIII || 1963 || 116E || 1,498 cc || 90&nbsp;bhp || Improved Mk.V on 5 main bearing 116E || [[Lotus Seven]]
|-
| Mk.IX || 1963 || 116E || 1,498 cc || 120–125&nbsp;bhp || Racing version of Mk.VIII || 1.5 litre class
|-
| Mk.X || 1962 || 116E || 1,498 cc || – || Experimental [[Lotus TwinCam]]. For [[Lotus 23]] || Development of Mk.XII and XIII
|-
| Mk.XI || 1963 || 109E || 1,098 cc || 100–110&nbsp;bhp || Improved Mk.IV, dry sump || [[Formula Junior]]
|-
| Mk.XII || 1963 || 116E || 1,594 cc || 140&nbsp;bhp || Racing [[Lotus TwinCam]], stock crank and rods, dry sump || [[Lotus 20|Lotus 20B]], [[Lotus 22|22]], [[Lotus 23|23]]
|-
| Mk.XIII || 1963 || 116E || 1,594 cc || 140–150&nbsp;bhp || Improved Mk.XII with steel crank and rods, dry sump || [[Formula B]], [[Lotus 22]], [[Lotus 23|23B]], [[Lotus 23|23C]]
|-
| Mk.XIV || 1963 || 116E || 1,498 cc || 100&nbsp;bhp || Improved Mk.VIII || [[Lotus Seven]]
|-
| Mk.XV || 1963 || 116E || 1,594 cc || 135–145&nbsp;bhp || Racing [[Lotus TwinCam]], steel crank and rods, wet sump || Lotus 26R, [[Lotus Cortina]]
|-
| Mk.XVI || 1963 || 116E || 1,498 cc || 140–150&nbsp;bhp || Mk.XIII for 1.5L class || Note<ref>Mk.XVI was used by [[Bob Gerard Racing]] on Cooper T71/73 for [[John Taylor (racing driver)|John Taylor]] at [[1964 British Grand Prix]], but was entered as "Ford 109E engine" for reasons unknown</ref>
|-
| Mk.XVII || 1964 || 109E || 1,098 cc || 120&nbsp;bhp || Improved Mk.XI, downdraft intake ports, dry sump || [[Formula Junior]]
|-
| MAE || 1965 || 109E || 997 cc || 100–110&nbsp;bhp || Improved Mk.III, downdraft intake ports, dry sump || [[Formula 3]]
|}
In addition to the above, Cosworth designed and provided the assembly work for [[Lotus Elan]] [[Lotus-Ford Twin Cam#Special Equipment|Special Equipment]] optional road engines with special camshafts and high compression pistons.

The final model of the above initial series was the ''MAE'' in 1965, when new rules were introduced in [[Formula 3]] allowing up to {{convert|1000|cc|1}} engines with 36&nbsp;mm intake restrictor plates. MAE used one barrel of a two barrel Weber IDA downdraft carburettor with the other barrel blanked off. The domination of this engine was absolute as long as these regulations lasted until 1968. As Cosworth had a serious difficulty meeting the demand, the MAE was mainly sold as a kit. This experience led to the later FVA/DFV contract to be drawn where the responsibility of development rested with Cosworth, and the manufacturing right and responsibility rested with Ford. There also were some specially cast iron heads with similar dimensions to these brazed heads with titanium alloy valve spring retainers called the "screamer head" for MAE in later years.

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