Tbi manifolds

[jamber2541]

Is there a difference between the 87-89 intake manifolds and the 90-91 intake manifolds on K5 small blocks I want to add a Holley TBI and want to know the difference between the 502-6 and 502-9 part numbers.

 

[sweetk30]

more than likly just has a.i.r. ports or non a.i.r. ports in manifolds.

 

[dyeager535]

He's talking intake, not exhaust.

Maybe there was a change in how the EGR valve mounted?

 

[btolenti]

I believe the difference is in the IAC and/or TPS used on the throttle bodies. I think the connectors on each sensor changed in 90....

 

[jamber2541]

The reason I asked is because I have a 90 and it has the connectors for the 87 to 89 models. That answers that, what size are the throttle bores supposed to be?

 

[sweetk30]

 

[btolenti]

stock bore size should be 1-11/16"

Both the holley and the 454TBI should be 2"

 

[jamber2541]

thank you all for the info