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Your friend blowing the motor over this is a joke. Just like my other friend that said him and a friend built an engine and a hair got stock between the cam lobe and caused the stock engine to open the valve just a bit to much to hit the piston.
If your CAS isn't reading then you won't be getting fuel and spark. You'll be getting misfires, because it can't detect RPM. When a tire is rubbing on fender something is wearing down, that is the same thing as your CAS, if it's rubbing something you will have wear and tear.
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