At 400+hp, What kills A904s?

3-4K for a 904 streeter Yikes. I build mine like the 904 race recipe.

Learn to do them on your own, they aren't hard.

Same ol' **** in these threads.
That is with billet input and output shafts and transbrake which most street driven cars wouldn't probably have but 1 car is mid 700's and the other is higher 900's and so necessary for reliability at those levels and yeah I do like to street drive as well as I get more use out of the cars that way.......wear parts out quicker? I suppose that is true to a degree but i'm not financially strapped so life is short and I don't care. I also have a basically stock nicely done 71 Demon 340 with a 4 speed that is obviously a much better street car and I drive it a bunch but it's hard to ignore the lack of power when compared to the other ones.