How much engine cc on a harley Davidson sportster?

That depends on what year it is.

1957-1971: 883cc

1972-1985: 1,000cc

1986-1987: 883cc & 1,100cc

1988-2010: 883cc & 1,200cc

It should be noted that all Sportsters of all years and all displacements have the same stroke, 3-13/16", only the bore differs.