As for the old iron to iron gas engines, seal or don't seal, your option. If forced to reuse a head gasket then I would recommend a thin coat of spray sealer
Proper cleaning, chasing the bolt holes, wire brushing threads, checking for flatness, proper sequence, torque, and retorque is the secret to success.
If you do use sealer, be very stingy with it! What you don't want is a heavy thick coat that will get trapped and temporarily "float" the head and slowly spread out with heat, leaving the bolts loose. The other danger is closing off steam vent holes or the oil port to the rockers(if equipped). That's why I prefer the aluminum spray paint.
As for late model engines, aluminum heads or block, or diesels, there will be engine specific procedures, step by step requirements that must be followed to the letter! My experience with aluminum heads in general, always get them leveled and check the cam bore alignment if it has been overheated.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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