A local guy had an engine lock solid caused by the binding of Ally case and Ally pulley.
I've had that myself on an AutoLinea case and EMPI laser engraved pulley.
Upon disassembly, the brand new engine case cracked a bit at the pulley-end. Had to get it welded, and then "line bored" the pulley hole again.. Not fun, 2-3 days before the race.. But got it fixed in time