Yesterday I measured my TB and I don't think that I measured my TB size wrong. I measured across the middle from the air lid size and took the inches and converted it into MM. I came up with 85 it is on the stock ls6 manifold is that possible and did I measure it right?

 

i think they are 75mm...take a pic of it.

 

You have to measure the TB blade to determine if it is a 75 or 85mm TB.

 

So measuring the blade would that require having to disassemble the throttle body?

 

No just push it open and measure with tape measure

 

Just measure the rear opening, not the front. Itll be close enough.