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THICKNESS is the only way to tell. The pad on top only tells you that the head is from 1973 or newer.
Might be true in Australia, but in the US I'm pretty sure the photo I posted will work for ID of head types. There were clearly market-dependent differences between engines during the early 1970's. Your statement above is a good example. That simply wasn't true in the US, where there were no 1972 model year engines with "E" heads... thick, thin, or otherwise. :)
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Gary L - 142E ITB race car, 73 1800ES YouTube Racing Videos
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