i originally tried the ngk v power 7 out of my old heads. it looks like the threads in the heads are messud up. all the threads looked good, so i never figured it would be a problem. heads are on the motor right now, i might try to chase one of them and see how hard or easily the chaser goes down.
yes there are new, i ran the chaser down all the holes(with grease), and it looks like i caught all the alluminum. i opened the exhaust valve on each cylinder and blew air into the cylinder and out the spark plug hole. it looks like they had a bad tap or atleast a bug on it, when they tapped these. anyways, the chaser cleaned the heads up, so it looks like i avoided a small tragedy. im guessin that if a little chip of aluminum made it into the cylinder, it probably wouldn't hurt anytning being softer than the rings and cylinder wall? lesson here, definatley run a spark plug down each hole before bolting them on.
Crank the engine over about a dozen times with ALL the plugs out before you continue. Aluminum chips will blow out the holes. You leave out the 8 plugs to stop chips from blowing into the intake and other cylinders and becoming trapped.
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