My take on the oiling system crossover tube for the small block

nm9stheham said
For reference, I just measured 2 here in the same fashion:

273 block - 7-1/2"

360 block - 7-7/8"

The one deeper down, in the 360 block, was above the oil passage to the filter by 3/8". It was driven in with the cup 'down' (with the flanges were down).

There is nothing critical about how deep this step is, and it may not have been critically set when originally drilled. And the plug may not be driven home all the way. Plus, if the plug is driven in with the cup 'up', the measurement from the pressure sensor hole is going to be deeper by around 1/4"-3/8". So, I don't think that any of these numbers listed in this thread are going to be exactly repeatable, block to block.

Jadaharabi said
.
2 1/8 - 2 3/8 inches under the cap

7 1/2 - 7 11/16 at the top

I would see if you could tap it in about 3/8 to 1/2

I just measured another 360 block I have in my garage. From the top it is exactly 7 1/2".

You can see here the mark on my 408 is 1/2" from going in on the 360 block I measured. :

Measured from the bottom:

2 1/4" inches:

Could this be a problem? Do I need to tap that oil plug in my 408 up from the main cap side a 1/2"?