Plugging smog holes in heads....

Jadaharabi said

The only thing I do different is I blow air into the exhaust port to blast the chips from the tap back out the hole before I put the plug in.

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I clean the holes out IF the heads are off. I won't blow air in there with the heads already on the engine. If a shaving is blown on the exhaust valve, it could fall in while the motor is cranking to start.