it had 3 major designs:
89-92 had the strongest bottom end with the big rods capable of handling 400hp stock, even with high mileage.
92.5-94 had a 1g 7 bolt engine. not as strong as the 6 bolt, but still a stout engine.
95+ (2g) this engine is garbage IMO. 35% of these have been reported to crankwalk. they have thinner rods than the 1g 6 bolts, and the head and turbo are designed for mid range power, sacrificing top end power. it may put out 20 more horses stock over the 1g engine, but the 1g 14b can hold 300hp without running out of breath, unlike the measly 2g T25 that cant hold anything over 250hp.
many people swap their 2g's for 1g 6 bolt engines to eliminate the worry of crankwalk.
DSMer: i just got a shitty 4g63T.
honda guy: ill smoke you.
DSMer: i hope my tranny holds up.
*DSM launches and hits 120 mph before honda boy gets out of 2nd gear*
honda guy: DAAAAAAAAAAAAAAAAAAAAAAAMN! i want one of those!
4G63t Guy - "Mmmmhmmmm."
*LS7 V8 runs a 12.81s*
*4G63t runs a 11.98s*