There are a lot of differences between the C8 Corvette ZR1's LT7 engine and the Z06's LT6, even if the two dual-cam V-8s share a few key components.
LS9: 9 bolt The crank shaft on the LS series engines does not extend aft as far as its older small block bretheren thus a crank shaft spacer/adapter plate is required if using a previous generation automatic transmission and torque converter. ...