"are really high compression pistons. FLAT" ......... lol That is not high compression, what is it maybe 9:1? Tops lol If i could get it at 8.5:1 i would run 15psi all day on it with a MPI. I am looking for another starion for a DD, if i rebuild the motor for sure going to flats, if i don't put my 4G64 in it. i run 10.5:1 and 15psi on my drag saturn