That blurb from the text under the picture was referring to the fact that the SD was different than the early engines I think?
Here is what was in the article later on:
Quote:
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Discussing the emissions system of the Super Duty 455, McCully stated that preproduction SD engines with the 041-spec camshaft such as those found in the engineering test mules and press cars should have had the first-type system. But EPA certification for a cam change delayed the SD's release until late April 1973. Since the changeover to the second-type system occurred prior to that, it is unlikely that any production SD engines received the first-type system.
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The thread on Micheal's 'test' TA probably had the 1st version egr.
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