Titanium.
You should turn the Jspec engine to TDC and then pour ATF in it and let it set. Then after a few days, rotate it and add ATF. After a rotation or so, that should loosen up the seals and break down the carbon build up.
I bought about 25 complete T2 engines that were low compression from a place in california and about 75% of them were carbon locked.
Bryan
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