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I recently purchased a 78 Bronco and needed work on the engine, so I took apart the heads. I noticed some sort of sludge on the valves. I have attached some images.
The sludge is in some valves gooey and on other parts it's already hard, I believe it was because of the heat of the engine when they ran it. I saw the engine running and the next day the valves got stuck and wouldn't move and bent several push rods. I also had to get a new gas tank since it was rusting and had old fuel. I have already tried some degreaser (Formula 88 Cleaner and Degreaser), sprayed and left it for about 10min but its still hard to remove the hard parts of the sludge. Anyone have any ideas, my next step would be leaving the heads soaking in hot water with the formula 88 degreaser for like 3 hours.


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Ford-a-Holic
1996 EB w/5.8 TOO much lift, 44" Mudders & 5:43-5:38's
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Looks like your valve seals are bad, the only way to really clean them is to hot tank them. Not sure on the mileage, but it looks like it might be time to go through the heads, maybe even the engine.
 
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