Looking for G-Body Frame Notch Info

[BigBlockOlds]

BigBlockOlds: How much of a tub are you doing? It looks to me like around 2", correct?

I went to the factory seam on the frame rail which I believe is around 1"-1.5". Probably closer to 1.5". So the wheel wells will be moved in the same amount.

Also, how much do the flares ad beyond the original 1/4's?

Not much. Maybe an inch or so.

How do the 315's fit w/o the flares. I have done an 1.5" tub to each side of my monte and I am pretty sure I can clear 315's, but thought I would ask since you already have a wheel/tire to check fitment.

The 315's fit perfectly fine without the flares. In fact, with the flares, the 315's look a little too narrow. Or at least to far tucked in. The fender lip might need some minor clearancing or rolled completely. But you should be able to get them to fit without needed flares.