Spark plug removal concern?

PBlaster won't hurt it if it did get into the cylinders, it would be a tiny amount and instantly burnt off. What I would do is start it, run it some. Use air to blow any dirt from around the plugs, then a quick shot of blaster into the wells. Then remove the plugs. They should come out without a lot of fuss.

Run the engine, while it is warm spray it. Then let the engine cool down and remove the plugs. You do it this way because of thermal expansion. The plugs are made of steel, the head is aluminum. The have different rates of expansion that makes the plugs grip tighter as the aluminum expands when heated up. The plugs dissipate heat from the cylinder through the threads and seat and they expand as well. So when they are warm they are the tightest they can be. Now you shut off the engine and the coolant and aluminum cools off fastest with the plugs holding heat longer and staying expanded a little longer due to them being steel. Once they all cool down the threads will "loosen" up some, the blaster can then seep in a bit. Now you can break them free and remove them.

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