Call summit. I was at a party one friday night and I got to talkin' about motors and racing, I remembered I needed some headbolts and a hardened oil pump driveshaft. I called summit around eleven pm and ordered my parts. They were sitting on my doorstep the following tuesday. How's about a few days worth for some piece of mind and a company big enough to warranty allowance a broken part even if they aren't sure if it's a factory fault vs. installer fault.