IMO, too small. I run at least a 14" X 3" filter on my big block Fords.... I suppose you can get away with a lot less, especially if you aren't fussy about how good of a filter you use.... I use the washable ones and try to have as much air available as possible for the carb to draw in..... The expensive way to check it is have someone with a flow bench check the flow rate of the filter and it's housing, otherwise I'd say bigger is better......