[Keith True]

An old Detroit engine mechanic I knew said a lot of guys go by the,tighten it until it breaks and back it off half a turn rule.There were some fuel crossover tubes in the old engines,if you tightened them to Detroit's specs in a week or so you would fill your crankcase with fuel.He just knew how much to tighten them with a 1/4 inch ratchet.New ones were OK to tighten by spec,but once used you had to use your experience.