![]() ![]() Rods: All 144/170/200/250ci engines have forged H section connection rods, with the exception those built in 78-79, which used either cast iron, cast steel, or nodular iron. While the 200ci from mid '64 onwards, and all 250ci blocks, had seven mains bearings. Main Bearings: All 144/170ci, and 200ci blocks prior to mid '64, had four main bearings. The crankshaft and flywheel are dynamically balanced, and the crankshafts are fitted with a harmonic damper, which is often called a balancer. All US cylinder heads incorporated an integral one barrel intake manifold, more commonly known as a log intake. General Description: The Small Six (or Falcon Six), overhead valve, inline 6-cylinder engine was introduced in 1960 with a cast iron block and cylinder head. One last example is the oil pan, also non-interchangeable, as the Australian and Argentina 250ci oil pans (and blocks) are one inch narrower in width. However the AU-250ci Crossflow distributors and cylinder heads are unique to the Crossflow and will not interchange with the US-200/250ci engines. ![]() The US-200/250ci distributors and cylinder heads will fit an Australian 200/221/250ci Pre-Crossflow, and vice versa. Therefore the oil pumps are not interchangeable. Another example would be the oil pump, while the oil pump drive is the same size, the bolt patterns are different. Therefore exhaust headers produced for an Australian 250ci will not fit the For example, all US-250ci engines had a low mount starter, while the Australian and Argentina 250's had a high mount starter. Some of these differences are the same as their US counterparts, while many are not. ![]() While Australian and/or Argentina built motors are similar to their US counterparts, they have their own unique set of differences. In this article we'll cover a majority of the differences, for engines produced in the USA, even though you only need to know three to identify the engine size (see Summary). To the inexperienced enthusiast all small sixes look identical, however there are minor differences which can be easily spotted if you know what to look for. Ever wonder what size motor you have? If so, your not the only one. ![]()
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