I have a system . . . remove the nuts off the studs and leave just 2 nuts on the back. Find a piece of metal stock just wide enough to slide under the studs. Back the nuts off against the metal stock and it'll lift the power . . . combine this with heat (map gas) and worst case heat and air chisel to shake long bolts and vibrate aluminum oxide out. I've done well over 100 powerheads . . . you might have to sacrifice the long studs. I have extra studs if you need them.
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