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#7147
chstorm
Participant

Hi again Paul,

If your cylinder head was made for short reach plugs, Ted’s advice sounds reasonable. Try measuring the length of the threaded part in the head. If it is 1/2″, then it is made for short reach plugs.

However, an engine goes better if the electrodes protrude into the combustion chamber. You may safely use your long reach plugs in a head made for short reach plugs if there is room for them. To avoid the problems described by Ted, you may unscrew them once in a while to clean them and remove deposits in the threads before they become troublesome.

As always, there are different opinions and different solutions – Ted’s advice is surely very sound if you have a cylinder head made for short reach plugs.

Best regards,

Carl