That does not sound good. But double check. Your cams , make sure you are on compression strokes you know #1 and #5, pistons are starting to head up to top dead center after the intake valve has closed. If a valve is opening you are 180 degrees off. ( TDC ) You know also if the whole bank is down/no compression. Turn engine over by hand only, you can feel if it hits if you are careful and back it back off some. Clund ker chunk is very bad with the starter engaged.