Alright, ive been troubleshooting for a few weeks, here and there on spare time, i have a 94 gsr engine in a 90 civic ef si. power is going to the selenoid at 4400 rpms ive checked that, ive changed the selenoid and the pressure switch and thats fine.. so what i need to know is do you have to drill out an ls head on a gsr block? its something in my engine why its not working, it hasnt worked since we swapped it. thanks guys. also, vtec is at 4400 and butterflies are at 5700 right?