I have done several searches and have come up with nothing, the question being; is there a difference in the intake manifold of a MAF car and SD car. I am looking for a manifold on ebay to play around with but im not sure if the older ones will work on my '91 Z28. Any help would be great.

 

The only difference between the two is the plenum on the SD cars has a vacuum port for the MAP sensor. It won't make a difference though if you T it off an existing port on a MAF plenum. 88 and older also had provisions for a cold start injector in the runners. The bases are the same.

 

Just making sure I am getting things straight, the base or manifold for all TPI cars are the same no matter if they are SD or MAF is what you are saying correct? If that is true is there a difference in a base for a 305 compared to a 350?