So you know what I'm talking about, go to mcmaster.com and search for flange bolts. When I bought my 454 K30, it had a nasty rattle-clunk-chingching coming from the TC cover. Figured the flexplate was broken. Popped cover open, and 1 bolt is broken, 1 is missing, rest are loose (to the TC). Think I should drop it and check the crankshaft bolts too? Next Q is which kind of bolts. The factory ones have a smooth flange. I was thinking about using serrated flange bolts to prevent them backing off, but might the serrations create fracture points in the flexplate, and/or grind it up = weaken it if/when they are taken in/out? Maybe just use smooth flange bolts with loctite?