Warm it up with correct amount of water in header tank and then run it at about 2500 rpm for a couple of minutes and then turn it off and let it cool for a few minutes,remove the plugs and look to see if one of them is cleaner than the others and that would probably be due to the water in the cylinder giving you more O2 and therefore better combustion and the possibility of HG failure as the plug would be burnt cleaner than the others.
Emulsified oil in rocker cover can be many things,short journeys,crap oil,lack of service,does not always mean head gasket.
most simple and quickest test is to check for HC in header tank but you need access to gas test to do this (mot station).
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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