[Tyson Schmidt]

The reason is that With T cams, the intake valve closes very early in the compression stroke compared to a more aggressive cam profile. So the dynamic compression ratio will be higher, which could lead to detonation in high load situations.

If you look at factory specs, you’ll notice that the T has 7.5/1, E has 8/1, and S has 8.5/1.
The differences being matched to the cam profiles of the different specs.

8.5/1 is about where you’d want it with T cams. 9/1 with E cams, but you can set the cam timing at the low end to reduce the dynamic compression a bit to work safely with your 9.5/1 pistons if you go with the E grind. You may also want to run the ignition timing at 2.2 specs, which would be around 30 degrees at 6k.

Once the motor is broken in, you can do a compression test to get an idea of where you are. If it’s like up in the 190 psi range, your going to have issues. In tge 150 to 175 range should be alright. Maybe you can get better than 91 octane where you are.