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Originally Posted by MatadorRacing_F1
What exactly does this have to do with the thread?
Define unproven? On the contrary, why would they risk putting an archaic engine in the car? Car companies don't really give you cars hoping that you mod them and boost the crap out of them. Metallurgy has come a long way from the days of the 3S and JZ engines. Toyota does continue to build their engines with a wide margin for error.... the Aluminum metal matric block 2ZZs have been seeing up to 500hp. I wouldn't worry too much.
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Unproven as in 'new'. A blank that no one knows anything about. Tuners have to start from zero, parts manufacturers have to start from zero, that kind of thing. It makes for a bit of lag when it comes to improvements, getting parts or finding out the weak points (7M head gasket for example).
The EJ may have a long history but I don't think I would call it 'archaic' given all the changes that Subaru has made over the decades. It's been open deck, closed deck, semi-open deck (I even think iron and aluminum block at different times but don't quote me), DOHC, SOHC, NA, turbo, valve timing, Ichi could probably add to this...