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NE gasket set, do I need thicker o-rings?

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davidcumbria:
Reviving an old thread because I’m in exactly the same quandary. Hope you see this Steve. What size o rings did you fit and have they been ok ?

SteveW:
5 x 2.5 and they have been perfect. Done about 500 miles and zero leaks.

davidcumbria:
Thanks that’s good to know. Are they nitrile or viton and how thick was the gasket before compression?

SteveW:
Gasket was 1.29mm, original bang on 1.2.

Picture is my order from Simply Bearings, they are Nitrile. I went for the stronger shore rating of 90.

davidcumbria:
Thanks. My vesrah gasket is 1.4MM thick so an extra 0.1mm thicker than yours. Ithink it makes sense to go for the stiffer 90 shore ring given what’s going on with pressure and heating and cooling. I’ll ditch my cheapo eBay rings of that size and buy the same as you since there is good evidence it works  but the o ring has an even bigger gap to fill with my vesrah gasket. Any problems and I’m going to go original.

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