I have been searching for a good while now and I have found lots of info about using AVCS JDM cams in non-AVCS USDM 02-05 WRX heads but nothing about using JDM AVCS cams in the USDM STI AVCS heads.
Will JDM AVCS cams fit in the USDM STI AVCS heads and work correctly assuming proper tuning and supporting mods? To me, supporting mods to the heads would include valvetrain modifications to support 8K RPMs and porting.
I don't have huge power goals or anything. I would be very very happy with a well running motor making 375-400whp and the ability to crank to eight grand without the power dropping like a rock form the early sixes.