Oil galley plug question

[LuxurySportCoupe]

I've got an oil galley plug question for you guys. I'm putting my short block together and I've run into an issue. The machine shop tapped all of my oil galley holes for pipe plugs except for the one behind the distributor. After unsuccessfully searching everywhere for a brass plug to put in there, I wound up using a steel plug. Yesterday, as I went to pound it in, this happened (see attached picture). For peace of mind, I'd like to tap this hole and just run a pipe plug like the rest of my block, my question is, what size tap are you guys using for this? Thanks in advance.

[jayb]

1/4" pipe plug will work.  Make sure you tap deep enough so that the plug doesn't protrude into the hole for the distributor.  If the plug sticks out too far, the distributor won't fit all the way down into the block.

[blykins]

1/4" NPT tap.  It helps if you have a long tap.....5-6". 

Pioneer makes shorter plugs, so that can play to your advantage too. 

I usually run a dingleberry hone through the lifter bore after I tap that hole. 

[LuxurySportCoupe]

Awesome, thanks guys!

[cammerfe]

Make a custom-fit plug by cutting off both ends. A saw kerf to take a screw driver makes for simplicity.

KS

[Barry_R]

1/4" NPT tap.  It helps if you have a long tap.....5-6". 

Pioneer makes shorter plugs, so that can play to your advantage too. 

I usually run a dingleberry hone through the lifter bore after I tap that hole.

That is one plug position that I will often just use a press in one on.  Lifter bore and distributor limit the thickness of the plug and the depth of the threads gets kinda critical.  Really screws up your day when the distributor won't go in 'cuz you forgot to check it early in the build.  Y

You can safely mill off a portion of the diameter on the distributor to get clearance and allow plenty of rotation for advance adjustment if the plug interferes.  No idea at all how I came about learning that....