accessory holes B1Ba heads
The intake manifold bolt blind hole is drilled about 1” depth, so it intersects that area just under your circle. Here is a picture with a mark showing where the bolt hole should end up intersecting. You can see the bolt hole on the intake face there on the left.
In the spot your circle is drawn there is 1.4” depth to the intake coolant passage behind it.
The intake manifold bolt blind hole is drilled about 1” depth, so it intersects that area just under your circle. Here is a picture with a mark showing where the bolt hole should end up intersecting. You can see the bolt hole on the intake face there on the left.