head nut question

hey guys,

i just started tearing apart my engine so i can rebuild it. I removed the cams so i can take the head off but the head nuts seem to be of an allenkey type. Does anyone know what size allen key i would need?

Thanks

KA24DE? 10mm hex, Canadian Tire has the 3/8" drive socket for about 16 dollars IIRC. It comes in alot of the bigger Mastercraft tool kits as well.