The last two numbers were used to indicate the displacement ("BA" means 1600cc, "AA" means 1300cc), so we just focus on the first few digits. Ford engine block part numbers always have 6015 in the middle, so we can ignore that part. The easy way to tell these two versions apart is by the engine block casting number. Major upgrades included stronger main bearing caps, more deeply dished pistons, and a flat-bottom cylinder head which means that certain parts don't interchange between the Cortina and the uprated. For 1971, Ford beefed up certain parts to deal with increased power output, resulting in the "uprated" version that current FF1600 racers know and love. It is also called "crossflow" (or X-Flow) because this was the first member of the Kent family with a cross-flow cylinder head (earlier Kent engines had the intake sitting directly over the exhaust). The first 1600cc Kent engine is sometimes called a "Cortina" because it was first used in the 1967 Ford Cortina. The easy identifier? If you see a timing belt driving a single overhead cam, it's not a Kent! The valvetrain is driven by the camshaft via pushrods. Engines in the Kent family have a chain-driven camshaft that rides in the block, and a rocker-arm valvetrain located on top of the cylinder head (OHV stands for Over-Head Valve). The Kent engine is named, per Ford tradition, for the engine plant where it was produced: The Ford engine plant in the county of Kent in England. Be happy we're not counting diesel engines! Finally, there is the EcoBoost 1.6, the only 1600cc gasoline engine that came directly from Ford with a turbocharger. The Zetec morphed into the Duratec in the 1990s (confusing because the Duratec name has also been carried by a Zetec engine even by a Kent engine!). Next is the DOHC Zeta/Zetec from 1992 (confusing partly because production overlapped the Mazda/Mercury Capri DOHC). The third is the CVH, known as "Escort" in the US (confusing because the US-market Escort that used this engine was unrelated to the older European Escort, which was available with a Kent or a Pinto engine see why we tear our hair out?) The fourth is a Mazda-designed DOHC engine used on the 1991-94 Mercury Capri (confusing because the unrelated 1970s Ford Capri was available with either a Kent or a Pinto engine). This is the only 1600cc Ford engine that has pushrod-actuated valves.* The next in line is actually a de-stroked "Pinto" OHC engine (confusing because in 1971-cc engine in the Pinto was the Kent 1600cc engine). Taking them chronologically, the Kent is the oldest (1967-82). 1600cc is a very popular displacement for 4-cylinder engines, and Ford has built at least 5 totally unrelated inline-4 gasoline engines of 1600cc capacity.
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