hey, I just did a swap for someone because he needed a motor and i heard rumors while researching the swap before i went through it = the d16y series has 2 more HP that the d16z6 and the tourque difference is minor. even though they're different gens, its the same block = piston, rings crank... one major difference is you cant use a y8 oil pan on a z6 block.... 2 bolts dont match and the y8 has a knock sensor and a cracnkshaft sensor that will trip the engine lite on your setup if you use a z6 block, I know im talking about a y8 instead of y7, but y7 and 8's are closely related just as the z6 and y8...