If you get a cast iron case unit (1 year only I believe) they will hold up fine to beatin with a stock or warm 318. The difference in cast iron and aluminum cases is where the counter shaft rides on the case. The aluminum case is very common to fail and gall where the countershaft rides......since the unbushed counter shaft turns in high gear (unlike a standard 833) it is subject to more wear. You can have the aluminum case bushed and that will fix it. The cast iron case is almost bulletproof in this area, cause it's cast iron. I think that's what rumblefish was referring to...and he's dead nuts right.....again. However, if you want to invest a little bit, Passon Performance can supply you with parts to make one live behind a blown and injected Hemi if that's what you wanna do.