Sinister_Z28

Ok so im wrapping up a 408 build and i was looking at my new LS3 intake and i noticed it has one nipple on the back for a hose where the LS1 had 2 nipples. So what do i do only hook up one of em or something. This has been bugging me all night so any help would be awsome. And btw im running LSA heads. And i have already moved the MAP sensor from the back to the front so i know it isnt for that. Thank in advance guys.

Sinister_Z28

Anyone?

Old Geezer

iTrader: (3)

A plastic "T" comes to mind. Hook up all the hoses that way..

Sinister_Z28

So could i get a plastic T at like home depot or some thing.

badazz81z28

iTrader: (6)

You can run a T, they are just vacuum ports.

The bigger question....Why are you running LS3 heads on a small bore LS1??? Do the valves clear the bore?

Ls_Notch

It's for a 408...

Sinister_Z28

Yes its a 408. So where do i buy this T. Would i get it at autozone or home depot. This is my first time doing a conversion so im just trying to figure all this out. Also can a start a new engine before its tuned. I just want to make sure it runs before i trailer it 2i hours away to the dyno.

davidws6

iTrader: (36)

You can get the T @ home depot or a parts store probably.

If you are going from a ls1 to a 408 with different injectors and etc. I would not run it too long as it might get too much fuel .

Raptor_WS6

iTrader: (23)

the back of the ls3 intake has two "nipples"
one is big for the vacuum line from the brke booster

one is small for the vacuum line that goes to the HVAC line

did you need another "nipple"??

Sinister_Z28

On my LS3 intake i see the nipple for the brake booster and what looks like another nipple but it is either capped or u need to cut it a tiny bit cause it isnt open. Basically i just want to start it for a couple seconds just to make sure it starts and to make sure i have oil pressure.

Raptor_WS6

iTrader: (23)

yeah, mine is the same way, that capped one, im just gonna cut mine

here is thread i started

https://ls1tech.com/forums/generatio...s3-intake.html

RJDio

I've heard of people buying used intakes that have broken nipples and they rework them just fine. I would not tee up the hoses, just see what size nipple you need and shop for it. You can buy a nut backed nipple, or plasti-weld a nipple in. Just secure it really good. Try to match the location of the orig intake.

Sinister_Z28

Thanks i was just looking at it and was all like where do i plug in the second line lol.

Raptor_WS6

iTrader: (23)

haha me too

what did you do for the throttle able bracket?
i bought a holley one for 30 shipped

Sinister_Z28

I bought one from WS6 Store for about the same price and ill be running a 95mm Nick Williams TB. Are u doing a 408 build or are u going bigger.