not trying to be and ass but ,

do you knwo how to do a comp test,? CLT?

do as 3kgt told you do a leak down tet and go from there. or take it to ome one who knows .

since oyu say it doesnt have compression in 1 cylinder doesnt ness have to be the block, could be hte head, head gasket ,.. . lol jus tlook at 3kgt post.

but defenately determine where its leaking compression from