Alright, I have a 91 Auto SC and I was just wondering what king of benefits I am looking to see what I can expect performance wise from a rebuilt engine. My car ran REALLY good before this (with 125k on the clock). I am getting a valve job done, honing of the cylinders, new rings, and all new bearings. I also added ported manifolds to my list of modifications. I was just looking as to what I should expect performance wise. My best time is in my sig (with most times being in the low 15's). Will their be any improvement in my 1/4 times? I also heard the car may slow a little until it is broken in. Is this true? What is a recommended break in period, or in other words, how long have some of you waited before "getting on it" again?