help. what size are the nuts for a 400's cylinder.
 

subject kind of sums it up, somehoe when I took my motor down, I cannot find the bag I put the nuts to hold the cylinder down in. I went to auto zone and bought about 5 different nut sizes and thread counts and couldn;t find the correct size.

does anyone know what nut size they are and the thread count? are they metric becuase I tried most of the standard sizes and thread counts.

this is really holding me up because I can;t finish putting the rest together till I get the cylinder held down.