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

prochargedmopar said
As you can tell I'm a rookie but next attempt I will be using a 9/32 bit or smaller to start the hole straight.
Then I will step up a size.
Take it slow, double and triple check.
I also bought a few grinding stones to smooth the surface at the hole entrance so I can have an easier time starting the drill.
Just gonna de-bur it a little.

I flat out was in a hurry and went straight to the 5/16" bit which is taking out a lot of meat all at once.
My bad.

.
On my magnum block I started with a 1/4 inch bit then went to a 9/32 then 5/16.
On my 340 the factory, step drilled it with a 5/16- 1/4. The last inch or two was all that needed drilled into the galley.
I did learn to stick a long screw driver or bar into the galley to stop me from drilling into the back wall of the galley.

procharged don't junk that block yet.

I used a battery powered drill at low speed and drilled it dry.