Drill/Tap oil pan turbo drain

[Mars]

Hi, despite searching, I can't find any info. Curious to know what others have done on the 3100/3400/3500 cast alum. oil pans...

Does 1/2" NPT tap and 23/32" drill bit seem like the right thing here? With a male 1/2" NPT to -10AN male fitting ??

I wonder if i should go with NPT thread or just regular machine thread with a oring seal. ??

this : http://www.summitracing.com/parts/RUS-670710/

OR

this :

http://www.summitracing.com/parts/RUS-660501/

I am not afraid of drilling and tapping, Ihave the pan out already... I just want to know what would be the best way to do it, NPT or machine thread. What's stonger ??

[3400beretta]

I went with NPT thread, 1/2 NPT to -10AN.

Oh and, good choice on the turbo.

[walterdude]

http://60degreev6.com/forum/showthread.php/45630-Turbo-Project-Last-Minute-Questions-Advise?p=415562&highlight=#post415562

Here's a link to a thread that is similar to what you ask... Mostly after post #15
Good luck!!
Tom....

[ForcedFirebird]

I suggest you drill it a little small and use a tapered reamer to finalize the taper, or you may not get a good seal. Don't forget, you should have only about 2 turns until it's hand tight.

For ease (and accuracy if you are using hand tools), the machine thread and o-ring may be better.

The first link you posted is made more for a punched steel pan, drill a hole and put the nut on the other side.

[dskopek]

I suggest you drill it a little small and use a tapered reamer to finalize the taper, or you may not get a good seal. Don't forget, you should have only about 2 turns until it's hand tight.

For ease (and accuracy if you are using hand tools), the machine thread and o-ring may be better.

The first link you posted is made more for a punched steel pan, drill a hole and put the nut on the other side.

If you have the pan out you could weld in a bung and never worry about leaks. The pans are cast and if you clean up the area where you are going to weld it welds real nice.