I went to check the timing on my newly owen 91 F350, 7.5l and after closer look I was un able to find any mark on the balancer........I checked over and over and ven tried the whole range of my timing light and nothing visible from the top.......

Is there something wrong......also doesnt that year have a TFI module on the distributor.....cause mine doesnt have one on the distributor......was wondering if they swapped out the distributor....

FYI.......Nothing wrong with engine and no codes......Just runs a idles a little(not much) rough when cold.....