Just started head job again after four months of sitting. After seeing the results of valves getting bent again, I concluded the previous owner set boost at 15psi with all stock internals. Floating the head is the result of overboosting. I will be returning the gvr4 to stock boost by removing the aftermarket manual boost controller. I've ordered the 4g63 head from National Cylinder Heads for $430 without core. I will be planning on building my own core up in the future. I also ordered OEM timing belt and newer Evo8-9 Four Layer Head Gasket from DSM Graveyard for $150. This will be my second head removal, I hope boost pressures won't set me back again. I will have all parts by Wednesday, hopefully have it running by the weekend. Can someone tell me what is stock boost pressure and with stock internals how much it can handle up to? Thanks guys! I'll update when running!