What is a bulkhead fitting? I have a -10AN to 1/2" NPT fitting on the way as well as Fairclough's fitting for the rear.
I don't want to tap the side if its going to crack though.

 

A bulkhead fitting is commonly used for fuel cell stuff, but it's a fitting with some thread on the backside, tightened down with a nut. This is the one I used, with a copious amount of loctite on the back .

http://www.summitracing.com/parts/rus-670870/overview/

People have done it without cracking, but I've also heard of quite a few folks who had it crack on them, so my second time around I wasn't going to chance it. If my memory serves me correctly, to drill for the 1/2" NPT tap (which was already expensive) you need a 45/64 drill bit (which I didn't have, along with the tap). AKA, if you still need to buy those things, I'd just go bulkhead and not even chance it.

 

FWIW, I run the STM BS -6AN vent, STM -6AN rear and side VC vents all into a custom built Spec-Ops Motorsports catch can and it works perfectly. The only reason I had a catch can built was because I was running the BR catch can with the dipstick return and it would give my motor a bath after every trip down the track. The earlier post of the dipstick sitting above the oil is correct until you do a pull that slams all that oil back towards the dipstick and then has nowhere to go but into the catch can and out the filter. The other reason I had one made was because of the additional vent, I needed a can that had three inlets. So the (3) -6AN fittings should be more than enough to vent.

 

If I do a -6AN fitting instead, what size NPT should I choose, 3/8 or 1/4", or is 1/4 too small?
I had planned -10 with a 1/2 NPT but it looks like that cracks.

This is for the side of the VC not the back BTW, already have that fitting from Fairclough on the way. And I'll do the STM -6 in the BS inspection hole

 

If you're going -6 now for the front, just use the press in fitting from STM.

 

I am doing similar setup as yours. I have fairclough -10 an fitting for rear and STM -6an for side. Also going to use BS fitting and dipstick. 4 ports should be good for not having vent case issues.

 

Im not a big fan of the idea of drilling/tapping the valve cover. I went with a -10 AN push in fitting for where the pcv normally is, -6 AN push in fitting for the other port on the valve cover and welded a -6 AN bung onto the dipstick So far so good.

 

I had thought that drilling and taping the valve cover wasn't a big deal.....guess I was wrong.
I hope my 4 -6AN VTA will do the trick. In that case, I will have a whole bunch of 10AN stuff for sale....LOL.

 

Alright so if I go with STM's -6AN side piece, do I just cut off the nipple that is already there and then push the STM piece in?

 

You don't need to cut it off, the nipple is also pressed in. You just need to grab it with a pair of pliers and pull it out. Then press the STM fitting in the hole.

 

no doesnt matter the balance shaft timing inspection hole goes straight into the block

 

Perfect, thanks!

 

i am waiting on my new setup. ill have the -10 press in fitting on the PCV hole and 2 -10 fittings on the side of the valve cover. also i have the dipstick vented as well. this should be plenty of venting. if not ill just run no valve cover.

 

No problem. To everyone else, just wondering why everyone thinks they need so many and so large of vents? -10AN seems excessive and more than three vents seems excessive. I thought I was going overboard with the three that I had. Before anyone gets butt hurt, I really am curious. Wondering if maybe I need to add one more to my VC. Are you running high compression and still getting blow back? Are you quickly filling catch cans? As stated before, I won't run one from my dipstick ever again.

 

bigger is better when trying to vent pressure. so it can only benefit you. some have more pressure then others.