I would have to disagree with you since the Tbird SC is heavier (4200) and there are much faster Supercoupes out there than GP's I watched you guys from afar while I had my SC and at the time a 13 second SC was a pretty fast car. There are guys in the 10's on what you guys would call a Gen 3 blower. Granted it's been worked like no ones business but it's still a Gen 3. We had one guy with a modified blower with a home port job that picked up 70 Hp with a Magnum Powers blower matching inlet plenum and 85mm TB alone, with dyno sheets to prove it.
That car ended production in 94' and they are still coming up with stuff to go faster. Back when I got started you couldn't even buy a cam you had to send it in and have it reground, and we were damn glad to have it! Hell I checked in not to long ago and was surprised how many people are in the 11's now. There is a whole lot of nay-saying on this board and that's why the GP isn't where it should be. I even recall back in the day there was a shootout covered by MM&FF and there was also a SC vs GP shootout as well, do you remember those?
The biggest problem I have with what you said is that there is nothing else to do, BS there is always something else, you just haven't found it. It's like every time someone says something a bunch of people jump in and say No even though it hasn't been tried. I see a lot of parrots on the board and that isn't the way to be. Think outside the box.
By the way do you know what the weight of a rotor is? I do because I have taken them apart to that level and reassembled them. If you haven't done it then you don't know and if you haven't done it then at least be open to a discussion instead of "It's all been done before" or that won't work. Because it hasn't. It's amazing how the SC crowd has come up in HP but the GP crowd has just kinda fizzled into "Here do these bolt on's and that's all you can do."
I came on here and heard all this business about not being able to rebuild the bottom end and thought to myself that has to be one of the dumbest things I have ever heard. It can be done, if you know how to actually rebuild an engine and not take things apart put some new gaskets and bearings in it and call it a "rebuild".
Come on now lets make these things faster. Everyone should have a 13 second flat GP here by now. You guys are struggling to get into the 13's with an engine that already makes more than 1 hp/cu.in. I would think by now that there would be a list 2 pages deep of high 12 second cars.
Let the Sarge speak, as there was a hole (pun intended) discussion on drilled rotors over on the SC forum about 10 years ago, maybe longer.
Jeff