Hi all, I am considering having work done to restore a S/R head .It needs seats/guides/valves/skimming/welding the whole lot really so is going to cost plenty.Looking at the head before i decide, I see that the five bronze threaded inserts used to fasten the rockerbox down are all standing proud of the upper joint face by varying amounts, perhaps up to 10thou or so.It seems as if they have been stretched or pulled up slightly due to overtightening.
Has anybody come across this problem? The rockerbox sits well off the joint face as a result. I can flat them down no problem, but do they come loose/pull out?. Incidentally, only one insert has split the alloy in the usual fashion seen on alloy heads- the other four are OK, Cheers, Bob.