Tilt the ramp and the weight splits: mg·sin θ pulls the block down the slope, and mg·cos θ presses it into the surface. Friction can hold up to μs times that normal force. The block slides when mg·sin θ beats μs·mg·cos θ, which happens at tan θ = μs. The mass cancels out, so a heavy block starts to slide at the same angle as a light one. Here that's 26.6°.