I don't follow?

when you put the orings in did you use a lot of oring lube ? if so i would crawl under with a pillow to support my head ... gob a ton of lube in there.. and work it back in with one of those plastic ineterior trim tools. Id put a hose clamp around the return tube so it can be grabbed and turned as i worked it back in a tiny bit at a time ...

Why would i do this ?? because you have absolutely nothing to lose... if it doesnt work crush it, pop it out and from this point forward when you are under your car you have a reminder to " do better"

The two piece tubes work just fine. I always use one next to the oil pump fitting, so I can get a normal wrench on the fitting should the need arise. So not to worry you built in a weak point.

Yes sir, what I tried. The problem is there is so much compression on this O rings, it's impossible.

Yeah, I'm not taking a chance on damaging something over a silly oil return tube

Find a couple of Wrightwood Racing green viton o-rings. They're softer and go in nice. Use silicone paste. Oil won't work.

I thought the VR kit had Viton as they're green. I did use Wrightwood on the low end as I've heard that VR had a problem with the square O-rings between the cases for the oil pump having QA issues with pumps cavitating.

Silicone grease was used, I still can't believe this happened and I didn't check my work!

Do this long enough and you may have 1) put the heads on without the one piece return tubes you bought on one bank, and not discovered this until you had put the cam carrier on, and maybe installed the rockers and timed the cam.
2) Put the right side cam in the left side, or timed #1 and #4 backward.
3) Put a head or three on upside down (at least this is noticed earlier rather than later.

Having a good engine stand makes all the work easier, but being able effortlessly to rotate the engine can allow getting mixed up on which side is up. Not that any of these problems aren't easily avoidable.

HAHA, Walt, happens to the best of us.....

ive done a couple of these, im not admitting which ones.

Have you fixed this problem?
 

Tippy,

Have you decided which direction to take to get this nagging problem solved? I don’t think the big viton o-ring for the oil return tube could be forced to slide back in without damaging or compromising the sealing property of the o-ring. Keep us posted.

Tony

Ha, 1 &2 sound familiar
Tippy, you have tried what I would do - some upholstery type tool and lube. I get you on the compression. One other option might be a heat gun, Plus above.
Alan

Tony, bought a collapsible tube,I'm just not going to jeopardize damaging something tearing the engine down over a superficial part

I tried heat with lots of grease to no avail. Way too much compression on those monsters