I just bought new upper&lower intake plenum gaskets. The kit came with 2 different gaskets for the throttle body which one do I use? 85 305 tpi TA

 

Also the bottum of the throttle where the iac screws into and I think some water port. There is a gasket on there with a bunch of little bolts. What's that gasket called and how come I didn't get it in the kit.

 

the felpro kit I just used had two TB gaskets also but if you look at them only one will line up with the throttle body on your car...use that one. The other gasket you are refering to is not in that kit since there really isn't a need to remove the coolant passage on the bottom of the throttle body. If you need the gasket the autoparts store can look it up for you but you can also reuse it if its not too bad.

 

Do you mean line up with the bolt hole's Cause i think both mine did just the middle was different.

 

1 gasket has 2 TB holes cut out in it. The other doesnt. Go with the one that doesnt have the 2 perfect holes.

 

Why that one will it make a difference will it run different. There must be a reaon for difference. Thanks for the reply's

 

remove your TB and put the gaskets against it you will see that one will line up perfectly and one will not. Take a guess at which one you use

 

Still wanna Know why there 2 different ones I used the one with the 2 holes cut out is that the wrong one

 

I don't know about the throttle body gaskets problem but the other gasket you are talking about comes in a throttle body gasket kit from GM!
GM P/N 17113115

 

[This message has been edited by 86TpiTransAm (edited April 26, 2001).]

 

The TB gasket with the triangle hole lower center is for 85-89 MAF units. This allows idle air to pass through lower plenum to the small idle air tube and on into engine (small tube on driver side runner). The gasket without the triangle hole is used for Speed density TB's on early or late model plenums. Idle air passes thru machined slots with this TB into top of plenum behind throttle plates.

 

Excellent I guess I used the right one. I have the 85 with maf so i used the one with the triangular hole. Thanks alot