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was that guy reffering to a "ridge", it can form at the upper limit of ring travel and has nothings to do w/a block guard. Thats all I can think of, I haven't heard anything bad about a properly installed one. Theres a possibility that crappy ones that don't allow for proper cooling can affect things. An example of a good block guard it one that has numerous notches cut into it rather that little drilled holes. Otherwise install it when the engine is disassembled and hone the cylinder walls.
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"shut the door Joshua, and let death pass by..."
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