Mystery Vacuum box intake

[doctordeeptrack]

What is this vacuum box in the lower rear intake area with a 5/8 hose and a one way valve with a splitter on the end. When I bought the truck there were two hoses with bolts for plugs coming off the Y splitter from behind the plastic intake.. Don't know where they go so I just capped them. Also are the jackshaft front and rear bolts TTY? I just pulled the motor a second time to do the chains because I stupidly put anti-seize on the cam bolts and I guess they slipped. When the engine stopped running I checked twenty things from PATS to fuel only to discover no compression in 4 holes and the cams were out of time though it ran great for about an hour. I guess they just slipped. Is it true this in a non-interference motor and you can't bend the valves?

 

[Flash]

It's an interference engine. You bent the valves.

 

[swshawaii]

Ditto. Good article linked despite having this HUGE mistake.

Fortunately, the 4.0L SOHC is not an interference engine so a timing chain failure won’t bend the valves.

https://www.explorerforum.com/forums/showpost.php?p=3296644&postcount=6

 

[doctordeeptrack]

Yes I bent the valves. There was an eyebrow where every intake valve touched the pistons. Just got them replaced and resurfaced the heads ready to install. Still no answer on that black plastic box in the rear valley between the cylinder banks on the top of the block Where does that big vacuum hose with the splitter and the one way valve go?

Also anyone got any tips on cam installation. Valve spring pressure makes torquing tricky.
cams seem difficult to turn.

 

[doctordeeptrack]

ugly valve strike and the mystery vacuum box. decided to buy the subscription thanks SE for all the help.

 

[XLTrunner]

That mystery box is part of your positive crankcase ventilation (PCV) system. The one-way valve is your PCV valve...and, the two hoses coming off the splitter should each run to a hose inlet nipple either side of the underside of your upper intake manifold.

 

[doctordeeptrack]

thank you XLT. that is a relief. i have scoured junkyards looking for the routing to no avail.

 

[XLTrunner]

You're welcome. Should have mentioned you'll be looking for the two hose nipples that point towards the rear...rather than the ones on the bottom that point downward.