[rlearp]

Four bolt mains are mainly bragging rights in the beer hall, to all but the real racers. Plently of folks running 2 bolts a high hp levels, there is no "real" cut off. A switch does not get tripped at xxx hp and after that the block will most certainly self-destruct.

Most of it will be your useage patterns that will determine how the block will do. Girdles are cheap, I'd go with one of those for a little peace of mind.

Ron