N/A common block

[thedon809]

I was searching around about the oil drain for the turbo. One thread someone said it had a plug in the hole where the oil drain is, while others say its just not drilled out at all. Has anyone drilled the block out before? Or is drilling the pan and welding a nipple on the way to go? Would having the oil drain on the pan be too low and not allow it to properly drain?

[turbovanman²]

The pad is there for the oil drain, but its not drilled out. Personally, I would drill it out and tap it for a brass fitting, less chance of having oil drain issues.

[shackwrrr]

I had mine drilled out at the machine shop but you could do it, tap it to 1/2 in pipe thread then use a 1/2 in pipe nipple cut to length.

[4 l-bodies]

43/64's is the drill bit size you need if you are going to use the factory block pipe. It actually is fairly common bit for drilling out wheel stud holes. I bought mine on ebay. HSS quality. If you don't have tools to drill this out while keeping block perfectly steady, let a machine shop do it for you.
You can put oil drain in oil pan, just keep hole above where oil level is. This is actually a good idea as the factory oil drain throws the oil on the #4 rod. Not great for windage. Obviously putting oil drain in pan will require custom line. Make sure it is a -10AN if you go this route.
Todd

[supercrackerbox]

My machine shop charged me $15 to drill the hole and swap in a tube from another block. Probably less than I would have spent on a drill bit that size.

[anarchyjet]

http://www.harborfreight.com/8-piece-silver-and-deming-drill-bit-set-527.html
http://www.harborfreight.com/6-piece-pipe-tap-die-set-91395.html

Use the 11/16" drill and 1/2" tap. Do a 1/4" pilot hole first, cast is soft and the cheap HF drill go through it like butter. Then screw in a 5/8" hose by 1/2npt brass fitting

[shackwrrr]

http://www.harborfreight.com/8-piece-silver-and-deming-drill-bit-set-527.html
http://www.harborfreight.com/6-piece-pipe-tap-die-set-91395.html

Use the 11/16" drill and 1/2" tap. Do a 1/4" pilot hole first, cast is soft and the cheap HF drill go through it like butter. Then screw in a 5/8" hose by 1/2npt brass fitting

I found that it was closer to 3/4 hose. The piece from TU was way too big for the 5/8 barb.

I just used a 1/2 in pipe nipple. Big inside diameter and the hose slipped easily over it.