Not all that common to crack a head most times it's just bad prep work for the Mhg.
Yes you could use the composite HG but keep in mind it will still need careful preparation if you are going to bump the boost above stock.
Carbide cutters aren't cheap.... polishing rolls or flappers aren't cheap.
Labour isn't "free" no matter who you are your time is worth something and to invest it into a job that may not show ANY improvement is just plain stupid.
As I said earlier you can only reach so far inside with...
The worst damage was in areas that hadn't been cleared for farming/towns and so on, the places with virgin bushland surrounding them had so much fuel available everything burnt to the ground.
Driving through there yesterday was quite sobering and I'm glad I did it while it's all still fresh...
Done a combustion gas test in the coolant yet?
As for the stripped bolt just drill the head with a 12.5mm bit so it pops off remove the head then undo the stud with vice grips.
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