Both use Hayabusa heads, but the Hartley motor uses a wider angle between cylinder banks (75* vs 72* for the Radical engine). I think beyond that, the differences are minimal.
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Cameron originally envisioned the Terminator as a small, unremarkable man, giving it the ability to blend in more easily. As a result, his first choice for the part was Lance Henriksen. O. J. Simpson was on the shortlist but Cameron did not think that such a nice guy could be a ruthless killer.
-From the Collector's Edition DVD of The Terminator
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