karen, try to take all the tin work off first then flip the engine up side down(makesure oil is out) and then try to locate the head bolt threads. you should see them going thought the fins/block. with the block still up side down try to spray the bolts with w-40 or something that is equal to it and let it sit for couple hours and also spray it couple times. use only a 6 point socket and a bar extension. without looking at it my self I believe your bolts could be rusted and swelled up. they may just break off too...not good.