intake manifolds

[aaklingler]

Is there a change in the intake manifolds around 99 like diameter from what to what?

 

[Double-S-Diesel]

2 1/2 or 2 3/8 to 3"

 

[Mike]

2 1/2 or 2 3/8 to 3"

Do you know if the bolt pattern was the same on the OBS/SD intakes?

 

[Double-S-Diesel]

SD uses 10 obs uses 7, but they will interchang