There are some funny differences!
The four bearing Aussie 144 and 170 engines from 1961 to 1964.5 were all US spec apart from the carb and some electrics. Same bell housing, similar distributor pilot hole, similar Canadian casting numbers on pistons and head. After that, local content requirements made large changes to the bellhousing pattern and ignition, Bendix Stromberg carb
I can't remember if the first seven bearing crank 200 arrived in the XP or XR but the XR's got the seven main 170/200.
All were low deck engines, about 7.803" or so.
The XT got the first medium deck engines. Thsese were similar to the Argentine engines, the 188 and 221 were not seen in the US. Same 8.425" tall block (about 660 thou taller). The 188 and 221 change was just a stroke change, with no bore or piston alterations.
Only the different crank and rods. Either 5.37 or 5.15" rods and 2.94 or 3.46" crank stroke.
Same thing happened with the later 1971 on wards 200/250. 9.38" tall block, and either 6.27 or 5.88" rods and 3.126 or 3.91" crank stroke.
The x-flow runs deap trough pistons. 15.5 cc on the 200 X-lfow but only 6.5 cc on the 188, 200 and 221, which shared the same piston. Same as the US one.
The US 250 ran a 12 cc piston, but had a 9.469" deck, and the same 5.88" rods. The Aussie 250x-flow had deaper dish pistons. The 250 x-flow had 22 or 27.9 cc pistons, depeding on the year. Some 200 cross flows used the 250 pistons for duty as Taxis.
As a small note, some info in the tech section is wrong (con rod length in the 221, and the dates of the X-flow alloy head and carb details). I sent through corrections twice, but even when your bent on in-liners, its not easy to notice the errors unless you've measured the Aussie blocks, like I have!
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