5 quarts. Don't know if that includes the filter. I'd say this is a marginal pan, with almost no baffles. The race pan that most racers use, calls for 7 quarts and has almost no usefull baffles either, but seems to work. I'd run a windage tray in either case.
http://store.summitracing.com/partdetail.asp?autofilter=1=MIL%2D30740&N=700+4294840045+4294881444+4294908331+115&autoview=sku