[Pampered-Z]

1995-97 are thought to be 'better' in general. I say this because they had vented opti, larger internal fuel rails and crank position sensor. So for modding they have things you can use. 93+94 are each a bit different in their own ways, but the 94s have more in common with the 95s then the 93s.

Internally not much different in the short block. Actually the 93s had higher lift cams. 93 = 460 lift. 94+ 449 lift. The dual cats and revised exhaust manifolds contributed to the HP and torque gains. The 92-94 heads are suppose to have smaller water jackets so they can be ported a bit more, but still not enough to equal aftermarket.

1992 (vettes=LT1) - 93 had hardened pushrods, different fuel system, intake is very different then later years, injectors, fuel rails, FP regulator, oil filler tube, cam ( 93 cams have a smaller hole in the fron and a factor 93 can will not work on a vented opti car). Shorter opti drive pin.timing cover/timing chain/opti, and the alternator and TBs are specific to 92-93 engines.

There allot of other differents such as cooling system and electrical as well if you need that kind of info?

JB