I really like my Ecotec...
No worries, fuel mileage is great, I know it's bulletproof, plenty of power (5 spd), doesn't run as smooth as the 3400 though, but you really can't kill it from what I've heard from all kinds of people. No maintenance problems at all, whereas the 3400 will need LIMG and Water pump at some point, and possibly head gaskets in future if DEXCOOL isn't taken care of....
Just check how much an eco costs compared to a 3400.... you will spend twice as much for a 3400, and they have been around longer... Ecotecs are cheap because they don't break down often.
Ecotec is a great engine, a little rough, a little noisy, but easily moddable (j-body.org) and much better on fuel as well.
I would much rather have the Ecotec for long-term use.
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