Robert,

I didn't think that the top bolts of a SB timing chain cover were a problem since they came into the block and into "oil". I do have TPFE paste on the the other, lower, bolts since they clearly go into water.

1972 Cuda 340 4 speed, 2001 Ram CTD 4x4 6 speed, 1970 Duster 408 4 speed, 1996 Ram 5.9 2x4 auto, 1965 Coronet 500