Tell me if it is worn out or just some other problem. I have blow by from the breather cap that goes into the air filter, and leaves oil in there and I have to clean it out every so often. It never smokes out the tailpipe. Have to add a quart of oil between 2000 and 2500 miles using Castrol 10-40 in it. The plugs burn clean and I did advance the timing a little bit for more power. It also has some what sounds like lifters rattling around 2000 and higher rpm but not all the time, doesn't sound like rocker arms or rod at all. Just trying to convince myself it isn't rings or valve train problem but something else. The bronco gets 14mpg in town and 17mpg on hwy still. It only has 110,00 miles, 83 Bronco with 300, C-6, we don't have emission check where I live so I did away with cat, EGR is still there, but not hooked up and air pump still running; I did away with all the plastic emission lines. This model does not have the feedback system. Thanks for any ideas on this issue.