They remained unchanged until about ’81 when the intake ports were changed from an oval to a D shape (flat floor). In ’75 they were upgraded to a Duraspark ignition system. The 2.3 first debuted in the 1974 Pinto using a progressive 2Bbl Webber/Holley carb and a points distributor. Initially the 2.3 was supposed to be designed so that the 2.0 EAO parts would interchange, but due to different manufacturing processes it was not feasable) according to Ford, a couple of easy ways to tell if you have a 2.0L EAO engine, or a 2.0/2.3/2/5L lima engine is that the 2.0 EAO engine has 10 valve cover bolts while the Lima engine has only 8 valve cover bolts, and the distributor is in front of the number 1 intake port on the EAO engine, while the distributor is under the number 1 intake port on the Lima engine. They share nothing with the 2.3-2.5 litre HSC motors that were offered in the passenger car line from ’84-’91. They started life based on the German designed 2.0 EAO Sport motors that were first introduced to this country in the Mercury Capri’s from the early 70’s.
These motors are commonly referred to as either the Lima or simply the 2.X OHC (Over Head Cam) engines. Nice info though and props to the person who took the time and posted it. No problems if it has to be deleted for it being copied and pasted. From Technical Ford’s 2.0/2.3/2.5 litre engine family guide - THE H.A.M.B.
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