Originally Posted by Brian Carlton

The SDL ('86) gets Rotella Syn and a change at 5K. It's soot levels at that interval are quite low (less than .8%) and, on occasion, I go to 6K with it. One lifter decides to make a racket every so often.........not too frequently.

The '87 hasn't been driven in awhile.

I don't think anybody torques them..........but, I'd advise keeping the torque somewhat low to start. The gasket sealing ring is quite thin and you don't want to mash it flat. Try about 10 lb-ft. and see how it goes. That should be more than sufficient to properly crush the gasket and prevent the removal of the screws. But, check the screws after a month or two and make sure they will hold at this torque level.