how much horsepower can the 904 take?

dodge freak said
if its just an stock rebuild, it won't last so long, well depends how you drive. The 904 does need some beefing up to live a long time

Define "beefing up"......

the difference in cost between alto disc and kolene steels might be 40 dollars...and you dont have to replace the single wound spring....only need if you are going to rev it up over 6500 rpm...