I have rebuilt my 327, but before doing so it was producing a lot of noise from the flex-plate area. It had ran for about 3 years before I acquired it with the only problem being low compression. I found that the flex-plate to crank bolts were loose when I tore the engine down and that the compression issue was due to the previous owner installing standard pistons into an engine that was bored 10 over. I have resolved these issues but thought that I heard the noise try to come back again yesterday despite using new bolts and thread lock during the rebuild. Does anyone have possible solutions other than replacing the crank?