Thing is, it has been sitting for 6 months with a mixture of ATF and a thinner (I can't remember which one I used). Hitting it with a sledgehammer so far hasn't been able to budge it.
May as well try everything before I resort to splitting the piston. If it doesn't come out, I'm unlikely to spend any money boring out to sort any damage, given I have a non seized engine with a better head.
I bought the car in the knowledge I'd probably be binning the engine, so there's absolutely nothing to lose at this point.
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