For the 305 TPI though the years from 85-92? I know I had a book from 89 that had the 305 TPI running 15.3's. Anyone know? I have a 85 Roc that I would to know what it ran from the factory with the 215hp it was blessed with, so I can build on what times I may encounter with her. Thank you in advance.

 

My 85 TA ran 15.10@90 with just a catback.

 

Sounds about right I guess. Not too bad for 1985. She ran ok with just a cat back, then came the headers, cam, a/c delete and airfoil. Hope it is worth the money when the motor is broken in.