This thing is going to make a crapload of torque if I can get it tuned correctly...
Honestly, the method of adding 15 degrees to the IVC measurement is a bit inaccurate, since it assumes older, slower ramped cam lobes.
My cam has very fast ramp rates (Comp XFI lobes) so I need to fudge that # a bit. My IVC point is closer to 63 degrees, which would yield a DCR of 8.467:1. Still quite healthy, but probably about as high as I can go on 93 octane pump gas.
For those who are curious, here is how to calculate the intake valve closing (IVC) point:
1. Divide the intake duration by 2 (use advertised duration - @ .006)
2. Add the results to the lobe separation angle (LSA)
3. Subtract any ground-in advance
4. Subtract 180