Causes of engine block crack?

replicaracer43 said

And from the looks of it, it was recently honed, did you just put this together recently?

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Nope, previous owner did. Did quite a crappy job at it too. Many, many knucklehead things were done to the car that just didn’t make sense. Bellhousing bolts were all loose, flex plate bolts were all loose, crankshaft bolt was finger tight… I can go on and on…