What is this?

Below is a picture I took today while doing an oil change..... I have never noticed this bung before. It has a threaded female end on top. What is it for?

http://home.indy.rr.com/imac/what%20is%20this.jpg

Thanks,
Jake

That is where your Oil Cooler Lines leave the block and go to the Radiator..

Go to my Car Domain Site and I posted a picture of my lines and filter.

Jethro_3

Hey Jethro,
Is that custom built pipe you made for your intake? Or is it a kit. Sure makes your engine compartment a lot more roomy with that intake system and the Electric Fans.
Evan

True Flow Air Intake System. True Flow (http://www.airintake.com/)

Replaces the filter and the tube between the Throttle Body and the MAS. Little louder when in the throttle and can definitely tell a difference on get up and go....

Got it on eBay and the seller was in Montana so I had him hold onto it for 3 weeks until I got up there this summer. Sweet deal.

That is where your Oil Cooler Lines leave the block and go to the Radiator..

Go to my Car Domain Site and I posted a picture of my lines and filter.

Jethro_3

Ok, well there is only one hole. Where would the return line go?

Find someone with a HD, they have the cooling lines stock on theirs already. '03 and up are a little different.