POPS,K,no matter who what cc,you should replace cylinder studs APE!Jay,and use CycleX Kenny,MLS head gasket,surfaces level.....No leaks,Cylinder head torque goes from 16.5 to 22 ft/lbs!! Just my .02. You still got the NS 400/500 83? I sold my 83 NS400 last year to buy the turbo 750!Fun bike .....both of them! Bill