In attempting to correct a stripped thread on 2.5l 2002 Outback Limited with HG problem, dealer oversized block head bolt hole to 12mm, dont think we can correct to bring back to accept 11mm head bolt with helicoil, please advise if incorrect, but now we are looking at swapping with low mileage 2.0l JDM replacement, supposedly a swap by using 2.5 externals, any advice appreciated