I was lookin at an LS1 TB, b/c my friend is using an LS1 TB on his 3800 SC V6 and he wanted to trade me for a TPI TB. I was lookin on the LS1 TB and on the butterfly valve there was a half adome shaped piece on the uper half of the valve.. and so i thought to myself... "This has to resrict alot of airflow.." my question being... Is this piece necessary for the TB to function right.. my friend wants to know before he rips it off.... Any info would be great... I've never seen anything like it.

 

pics?

 

errrr... dunno how to do pics

 

I think he is talking abour the moutning ridge that TBI guy grind down on their butterflies. Am I correct? How is he going to use a TPI TB where he had an LS1 TB. They are completely different and have different mouting holes and such.

 

He's not using a TPI TB, never did... he has a 3800 SC V6 he just traded me his TPI TB for the LS1 TB

 

Oh ok. I thought you were going to use the LS1 TB on genI or II motor. And I thought he was going to use the TPI TB on his V6.

 

From the bottom



Wide open

 

I have no idea what the hell that is, but that isn't an LS1 throttle body anyways. Looks like he gave you the v6 one.

EDIT: It may have something to do with directing flow at part throttle, but it is definitely a huge restriction. I'm positive though that that is not an LS1 throttle body.

 

No that's the LS1 i gave him...i don't have the V6 one

 

There is a mod for the older style LS1 TB. However I did not see the EGR tube. The picture is not clear. Check ls1.com mod section.