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The stock O rings are metric? So an Imperial measure will probably be stretched a little or loose. That will affect leakage potential.
Then there is the Durometer issue. There is no OEM spec available.
IMHO better not to try to out-wit the OEM manufacturers on a low cost item like O rings. Just buy OEM from a reputable source - done.
The bigger issue is the spark plug tubes as mentioned above and explained in great detail elsewhere.
First measure the grooves in the tubes for o-o-r. In used tubes, also check for cracks developing.Go from there.
Last edited by Gelbster; 04-27-2017 at 06:35 PM.
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