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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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