I am looking @ purchasing a complete TPI system locally, unfortunately the seller only know that it was removed from an F-body. I understand that the only difference between 85-86 and 87+ was the center bolt angle, but i'm not sure i can visually judge that. Are there casting numbers on the base i could refer to? Or other obvious visual clues? Alternatively if anyone has close up pictures of the two different center bolt angles that would be helpful.

-Zander

 

On the 85 and 86 intakes, all intake bolts are drilled at the same angle. On the 87+, the middle four are drilled at a different angle. You should be able to tell just by comparing the inner four bolt holes to the others.