Dan..Ron,they're from a local company..OEM Products in Mt. Clemens,Mi. Mr. P-Body(Mike Rafferty)has been using their products for quite a while...with no problems whatsoever! And he revs his W-9 small blocks a whole lot higher than my 440! I'm going to pay them a little visit..hopefully tomorrow! I believe it's a QUALITY issue...heat treat issue! I might go visit Jeff K. first...I believe he's got a Rockwell hardness tester at his shop.