TBSS vacuum ports

[Bigru]

Hey guys, I need some help.. this is my first swap and I have no idea what I’m getting into. I have a 6.0/4l80 from a Denali, I replaced the intake from a TBSS. I’ve ordered a adapter plate to use the throttle body from the 6.0 intake. What does these connect to?

[mongocanfly]

https://ls1tech.com/forums/conversio...uum-ports.html

[mongocanfly]

I tried to find a good layout but not having any luck

[Bigru]

Thanks Mongo. No, that's not the brake booster port. I know I could have taken a better pic. it's the EVAP purge valve port. I would like some of the guys who has the same set up as me to chime in, please help I'm loosing sleep thinking about this. lol. i see a lot of guys has a port behind or on the side the throttle body, mines don't. I have 2 at the bottom.

[mongocanfly]

just curious ..but why did you change the intake?... I'm guessing the little extra hp

[mongocanfly]

found this...he says they capped the evap port and removed it from the tune...
http://www.silveradoss.com/forums/to...e-swap-how-to/

I'm having internet issues, but google tbss intake swap...it brings up a bunch of right ups and videos on it

[Bigru]

Originally Posted by mongocanfly

just curious ..but why did you change the intake?... I'm guessing the little extra hp

yes, chancing a lil more hp.

[sprint_9]

I dont know what the ports are on your TB, Ive not personally dealt with a Gen 3 TB but I think alot of them had a fresh air PCV port. If you can confirm that yours does have a fresh air port before the throttle blade then you can use that as your PCV fresh air intake.

I attached a diagram of roughly how things should go. Cap any unused ports.

If you leave the Gen 4 injectors on it you will need to update your tune to reflect those changes, that might be a big change over stock depending on what stock was and what the new ones are.