I have seen 604 filters fall off also we fill to hot full mark right from get go and you would have to get 1 WAY overfull befor it would cause any problems.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4