Ive rebuild several dsm motors and had a guy dropped off a 97 gst for a engine. He just wanted a stock 7bolt put back in it,I rebuilt a core and its ready for drop in,when he bought the car he was told it was crankwalked. I tried turning the old motor over with the 1/2" ratchet and it would go half the rotation and stop then the same backwards. Didnt seem crankwalked but when ahead pulled it. I decided to go ahead and pull the parts off it for my stock pile and found a pretty bad explosion to say the least .
Never seen this happen before but it seared the keyway on the crank and spun the timing gear.
needless to say I dont got too many parts for my stock pile lol
Im sure you guys have seen worse but looks bad to me
btw is there a pic section on here for when 4g63's go bad