Throttle Bodies

[boostmaster]

I was going thru my parts stash looking at some throttle bodies and I noticed that there are 2 different throttle bodies used on the 84-85 hot airs. 1 has a much smaller diameter idle air tube pertruding from the throttle body and also the actual casting is slightly different. Can anyone confirm this.

 

[6SENSE]

YES, the '85 has the larger IAC tube. I came across this a couple of years ago when going through my stash for a TB to send to Jay Jackson. I figured there had to be some [positive] reason that GM altered it so I chose the '85 one.