I have been searching for a while now and haven't found anything. Given the right cylinder heads, valvetrain, and maybe even upgraded oil pump, what can I safely spin the cast crank, cast rods, and hypereutectic pistons too. I would assume a rod would go first, but doesn't the 5spd cobra and mach 1 spin 7k on that same rod. I was told by one big mod motor building company 6.2k. But idk. Any thoughts? My head has been going crazy with motor builds for the race car.