What other 4 cyl. have higher pontential on stock internels other than the 4g63 gen 1 eclipse/talon engines?

4g63's are known to be pretty bullet-proof out of the box. Evo engines run pretty well on stock internals as well. The SR20 crowd can also claim very good numbers without changing much. But I would have to say that the 4g63 is probably one of the stoutest 4-bangers out there.