I am going through the prossess of thinning the heard again, but couldnt pass up a free 92 parts car. Its a n/a with an ill 5 speed, I think the box is a good candidate for a rebuild so I'm going to pull the thing out. I am also considering building up a fresh motor for my 88 spg. I've read here about using a 2.1 head to reduce compression and allow for more boost and using a 2.1 inlet manifold to help the engine breathe better (I think) but, what if I were to build the 2.1 for the spg? how can I lower the compression ratio from 10.1:1 to 9:1 ? It seems to me that shorter con-rods would do it but, are they out there to be had? Are the "dished" pistons for a turb eng. all it takes? Am I wasting my time thinking about this? Or is there more power to be had with an engine that will otherwise leave with the next load of scrap? Any thoughts , opinions or comments would be apreciated.