I was surprised, the plugs in it seemed really loose. The plug box said something about tightening to either a 1/4 or 1/2 turn. Anyway got the new ones in and the engine runs even better now that it has new plugs and the original wires, yes I said original, are gone. All but 1 plug were still within spec, one was under .020, probably close to .010 rest were around 025.