It turns out that the head is slightly warped.....allowing water past the valves of cyl 2/3.
So the head was sent of to the machine shop but on closer inspection he thinks it has been machined by a previous owner & didnt want to do it again ( too close to the lip of the valves ) so the mech has made a second very thin gasket which he has done before & reckons we have a 50/50 chance.
Sooo.the question is if this isnt sucessfull are second B4 heads available anywhere...whats a ballpark price & if there is 1 around it has to be shipped to Bali.
Bottom end looks great...cylinders polished...the new rings fit very nice & i hope this is going to get me running nicely with all the other replaced parts.